I just updated the code snippets for generating code with Phoenix LiveView and VSCode.
I accept suggestions!
I include the:

• Name of the module of the App(this is for changing for the specified project app - ‘MyAppName’)
• Name of the module of the App with the Web( ‘MyAppNameWeb’)
• new tag components
• render_slot
• the sigil ~H
• the form
• the label, input type and error tag f

elixir.json:

{
	// Place your snippets for elixir here. Each snippet is defined under a snippet name and has a prefix, body and
	// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the
	// same ids are connected.
	// Example:
	// "Print to console": {
	// 	"prefix": "log",
	// 	"body": [
	// 		"console.log('$1');",
	// 		"$2"
	// 	],
	// 	"description": "Log output to console"
	// }

	// Snippets for the LiveView Module name of the APP
	// "lv_module": {
	// 	"scope": "elixir, html-eex",
	// 	"prefix": "lv",
	// 	"body": [
	// 		"defmodule ${1}Web.${2}Live do",
	// 		"  use ${1}Web, :live_view",
	// 		"end"
	// 	],
	// 	"description": "LiveView module"
	// },
	// Snippets of the course Phoenix Live View By PragProg

	"app_name": {
		"prefix": "an",
		"body": [
			"MyAppModuleName"
		],
		"description": "The name of the App"
	},
	"app_name_web": {
		"prefix": "anw",
		"body": [
			"MyAppNameWeb"
		],
		"description": "The name of the App with Web( MyAppModuleWeb )"
	},
	"lv_module": {
		"prefix": "lv",
		"body": [
		  "defmodule ${1:Module}Web.${2:ModuleName}Live do",
		  "  use ${1:Module}Web, :live_view",
		  "end"
		],
		"description": "LiveView module"
	  },
	  "lc_module": {
			"prefix": "lc",
			"body": [
				"defmodule ${1:Module}Web.${2:Name}Component do",
				"  use ${1:Module}Web, :live_component",
				"end"
			],
			"description": "LiveComponent module"
		},
		"lc_module_helpers": {
			"prefix": "lh",
			"body": [
				"defmodule ${1:Module}Web.Live.LiveHelpers do",
				"  use Phoenix.LiveComponent",
				"",
				"  def ${2:name}(assigns) do",
				"   ~H\"\"\"",
				"   ${0}",
				"   \"\"\"",
				"  end",
				"",
				"end"
			],
			"description": "LiveComponent Helpers module"
		},
	  "lv_mount": {
		"prefix": "mount",
		"body": [
		  "def mount(_params, _session, socket) do",
		  "  socket = assign(socket, ${1:key}: ${2:value})",
		  "  {:ok, socket}",
		  "end"
		],
		"description": "LiveView mount function"
	  },
	  "lv_rend": {
		"prefix": "rend",
		"body": [
		  "def render(assigns) do",
		  "  ~H\"\"\"",
		  "  ${0}",
		  "  \"\"\"",
		  "end"
		],
		"description": "LiveView render function"
	  },
	  "lv_handle_event": {
		"prefix": "he",
		"body": [
		  "def handle_event(${1:event}, _, socket) do",
		  "  socket = assign(socket, ${2:key}: ${3:value})",
		  "  {:noreply, socket}",
		  "end"
		],
		"description": "LiveView handle_event function"
	  },
	  "lv_handle_info": {
		"prefix": "hi",
		"body": [
		  "def handle_info(${1:message}, socket) do",
		  "  socket = assign(socket, ${2:key}: ${3:value})",
		  "  {:noreply, socket}",
		  "end"
		],
		"description": "LiveView handle_info function"
		},
		"lv_handle_params": {
			"prefix": "hp",
			"body": [
				"def handle_params(params, _url, socket) do",
				"  {:noreply, socket}",
				"end"
			],
			"description": "LiveView handle_params function"
		},
		"lv_h_sigil": {
			"prefix": "sh",
			"body": [
				"~H\"\"\"",
				"${0}",
				"\"\"\""
			],
			"description": "The '~H' sigil. LiveView inline template. "
	  },
		"lv_component_tag": {
			"prefix": "<.",
			"body": [
				"<.${1:name}>",
				"  $2",
				"</.${1:name}>"
			],
			"description": "<. > component tag block"
		},
		"lv_render_slot": {
			"prefix": "rs",
			"body": [
				"<%= render_slot(@inner_block) %>",
			],
			"description": "'<%= render_slot(@inner_block) %>' render_slot function with the tag block"
		},
		"lv_component_render": {
			"prefix": "lct",
			"body": [
				"<.live_component module={${1:ModuleName}} id=\"${2:id-name}\" />"
			],
			"description": "LiveView Component render block"
		},
		"lv_component_render_with_module_name": {
			"prefix": "lctm",
			"body": [
				"<${1:ModuleName} id=\"${2:id-name}\" />"
			],
			"description": "LiveView Component render block without the imported module name"
		},
	  "lv_test_module": {
			"prefix": "lvtest",
			"body": [
				"defmodule ${1:ModuleName}Web.${2:ModuleTestName}Test do",
		  "  use ${1}Web.ConnCase, async: true",
		  "",
		  "  import Phoenix.LiveViewTest",
		  "",
		  "  ${0}",
				"end"
			],
			"description": "LiveView test module"
		},
	  "lv_test": {
			"prefix": "test",
			"body": [
		  "test \"${1:description}\", %{conn: conn} do",
		  "  {:ok, view, _html} = live(conn, \"${2:path}\")",
				"  ${0}",
				"end"
			],
			"description": "LiveView test"
		},
		"eex_datalist": {
			"prefix": "data",
			"body": [
				"<datalist id=\"${1}\">",
				"  ${0}",
				"</datalist>",
				""
			],
			"description": "EEx datalist"
		},
		"eex_input": {
			"prefix": "input",
			"body": [
				"<input type=\"text\" name=\"${1}\" value=\"${2}\"",
				"       placeholder=\"${3}\" />"
			],
			"description": "EEx text input"
		},
		"eex_hidden_input": {
			"prefix": "hidden",
			"body": [
				"<input type=\"hidden\" name=\"${1}\" value=\"${2}\" />"
			],
			"description": "EEx hidden input"
		},
		"eex_form": {
			"prefix": "eform",
			"body": [
				"<div>",
				"  <.form let={f} for={@changeset} id={@id} phx-change=\"validate\" phx-target={@myself}>",
				"    <div class=\"mb-4\">",
				"      <%= label f, :${1:name} %>",
				"       <%= ${2:type} f, :${1:name} %>",
				"       <%= error_tag f, :${1:name} %>",
				"    </div>",
				"    <div class=\"flex\">",
				"      <%= submit \"${3:Button Name}\", phx_disable_with: \"Creating...\", class: \"btn-primary\" %>",
				"    </div>",
				"  </.form>",
				"</div>"
			],
			"description": "EEx form"
		},
		"eex_label_input_error_tags": {
			"prefix": "liet",
			"body": [
				"      <%= label f, :${1:name} %>",
				"      <%= ${2:type} f, :${1:name} %>",
				"      <%= error_tag f, :${1:name} %>",
			],
			"description": "EEx for the form use the label, type of the input and errot_tag f"
		},
		"eex_checkbox_input": {
			"prefix": "checkbox",
			"body": [
				"<input type=\"checkbox\" id=\"${1}\" name=\"${2}\" value=\"${3}\"/>"
			],
			"description": "EEx checkbox input"
		},
		"eex_render_block": {
			"prefix": "et",
			"body": [
				"<%= $1 %>"
			],
			"description": "<%= %> render block"
		},
		"eex_end_tag": {
			"prefix": "eend",
			"body": [
				"<% end %>$1"
			],
			"description": "<% end %> end tag"
		},
		"for": {
			"prefix": "efor",
			"body": [
				"<%= for ${1:item} <- @$1s do %>",
				"  $2",
				"<% end %>"
			],
			"description": "EEx for"
		},
		"fori": {
			"prefix": "efori",
			"body": [
				"<%= for ${1:item} <- @$1s do %>",
				"  $2",
				"<% end %>"
			],
			"description": "EEx for comprehension with items"
		},
		"eex_ifa": {
			"prefix": "eifa",
			"body": [
				"<%= if $1, do: \"{$1}\" %>"
			],
			"description": "EEx if for attribute"
		},
		"eex_if": {
			"prefix": "eif",
			"body": [
				"<%= if $1 do %>",
				"  $2",
				"<% end %>"
			],
			"description": "EEx if"
		},
		"eex_if_else": {
			"prefix": "eife",
			"body": [
				"<%= if $1 do %>",
				"  $2",
				"<% else %>",
				"  $3",
				"<% end %>"
			],
			"description": "EEx if else"
		},
		"eex_else": {
			"prefix": "eelse",
			"body": [
				"<% else %>"
			],
			"description": "EEx else"
		},
		"eex_cond": {
			"prefix": "econd",
			"body": [
				"<%= cond do %>",
				"  <% $1 -> %>",
				"    $2",
				"  <% true -> %>",
				"    $3",
				"<% end %>"
			],
			"description": "EEx cond"
		},
		"eex_unless": {
			"prefix": "eunless",
			"body": [
				"<%= unless $1 do %>",
				"  $2",
				"<% end %>"
			],
			"description": "EEx  unless"
		}
}

and for use to HTML file templates put on the html-eex.json:

{
	// Place your snippets for html-eex here. Each snippet is defined under a snippet name and has a prefix, body and
	// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the
	// same ids are connected.
	// Example:
	// "Print to console": {
	// 	"prefix": "log",
	// 	"body": [
	// 		"console.log('$1');",
	// 		"$2"
	// 	],
	// 	"description": "Log output to console"
	// }

	"lv_component_tag": {
		"prefix": "<.",
		"body": [
			"<.${1:name}>",
			"  $2",
			"</.${1:name}>"
		],
		"description": "<. > component tag block"
	},
	"lv_render_slot": {
		"prefix": "rs",
		"body": [
			"<%= render_slot(@inner_block) %>",
		],
		"description": "'<%= render_slot(@inner_block) %>' render_slot function with the tag block"
	},
	"lv_component_render": {
		"prefix": "lct",
		"body": [
			"<.live_component module={${1:ModuleName}} id=\"${2:id-name}\" />"
		],
		"description": "LiveView Component render block"
	},
	"lv_component_render_with_module_name": {
		"prefix": "lctm",
		"body": [
			"<${1:ModuleName} id=\"${2:id-name}\" />"
		],
		"description": "LiveView Component render block without the imported module name"
	},
	"eex_datalist": {
		"prefix": "data",
		"body": [
			"<datalist id=\"${1}\">",
			"  ${0}",
			"</datalist>",
			""
		],
		"description": "EEx datalist"
	},
	"eex_input": {
		"prefix": "input",
		"body": [
			"<input type=\"text\" name=\"${1}\" value=\"${2}\"",
			"       placeholder=\"${3}\" />"
		],
		"description": "EEx text input"
	},
	"eex_hidden_input": {
		"prefix": "hidden",
		"body": [
			"<input type=\"hidden\" name=\"${1}\" value=\"${2}\" />"
		],
		"description": "EEx hidden input"
	},
	"eex_form": {
		"prefix": "eform",
		"body": [
			"<div>",
			"  <.form let={f} for={@changeset} id={@id} phx-change=\"validate\" phx-target={@myself}>",
			"    <div class=\"mb-4\">",
			"      <%= label f, :${1:name} %>",
			"       <%= ${2:type} f, :${1:name} %>",
			"       <%= error_tag f, :${1:name} %>",
			"    </div>",
			"    <div class=\"flex\">",
			"      <%= submit \"${3:Button Name}\", phx_disable_with: \"Creating...\", class: \"btn-primary\" %>",
			"    </div>",
			"  </.form>",
			"</div>"
		],
		"description": "EEx form"
	},
	"eex_label_input_error_tags": {
		"prefix": "liet",
		"body": [
			"      <%= label f, :${1:name} %>",
			"      <%= ${2:type} f, :${1:name} %>",
			"      <%= error_tag f, :${1:name} %>",
		],
		"description": "EEx for the form use the label, type of the input and errot_tag f"
	},
	"eex_checkbox_input": {
		"prefix": "checkbox",
		"body": [
			"<input type=\"checkbox\" id=\"${1}\" name=\"${2}\" value=\"${3}\"/>"
		],
		"description": "EEx checkbox input"
	},
	"eex_render_block": {
		"prefix": "et",
		"body": [
			"<%= $1 %>"
		],
		"description": "<%= %> render block"
	},
	"eex_end_tag": {
		"prefix": "eend",
		"body": [
			"<% end %>$1"
		],
		"description": "<% end %> end tag"
	},
	"for": {
		"prefix": "efor",
		"body": [
			"<%= for ${1:item} <- @$1s do %>",
			"  $2",
			"<% end %>"
		],
		"description": "EEx for"
	},
	"fori": {
		"prefix": "efori",
		"body": [
			"<%= for ${1:item} <- @$1s do %>",
			"  $2",
			"<% end %>"
		],
		"description": "EEx for comprehension with items"
	},
	"eex_ifa": {
		"prefix": "eifa",
		"body": [
			"<%= if $1, do: \"{$1}\" %>"
		],
		"description": "EEx if for attribute"
	},
	"eex_if": {
		"prefix": "eif",
		"body": [
			"<%= if $1 do %>",
			"  $2",
			"<% end %>"
		],
		"description": "EEx if"
	},
	"eex_if_else": {
		"prefix": "eife",
		"body": [
			"<%= if $1 do %>",
			"  $2",
			"<% else %>",
			"  $3",
			"<% end %>"
		],
		"description": "EEx if else"
	},
	"eex_else": {
		"prefix": "eelse",
		"body": [
			"<% else %>"
		],
		"description": "EEx else"
	},
	"eex_cond": {
		"prefix": "econd",
		"body": [
			"<%= cond do %>",
			"  <% $1 -> %>",
			"    $2",
			"  <% true -> %>",
			"    $3",
			"<% end %>"
		],
		"description": "EEx cond"
	},
	"eex_unless": {
		"prefix": "eunless",
		"body": [
			"<%= unless $1 do %>",
			"  $2",
			"<% end %>"
		],
		"description": "EEx  unless"
	}

}