GET request with JSON body - is it possible to handle?

Hi! I want to receive GET request with JSON body.

#router
...
  pipeline :api do
    plug :accepts, ["json"]
  end

  scope "/", PsRbkWeb do
    pipe_through :api
    get "/order", PaymentController, :index
  end
...

# controller
...
  def index(conn, _some_params) do
    IO.inspect(conn) # empty body_params: %{} in conn
  end
...

After I made GET request to “/order” with some json in body (with header Content-Type=application/json). - have empty body_params: %{} in conn in my controller.

Here is resulting conn, sorry for length:

%Plug.Conn{
  adapter: {Plug.Cowboy.Conn, :...},
  assigns: %{},
  before_send: [#Function<1.112466771/1 in Plug.Logger.call/2>,
   #Function<0.66982185/1 in Phoenix.LiveReloader.before_send_inject_reloader/2>],
  body_params: %{},
  cookies: %Plug.Conn.Unfetched{aspect: :cookies},
  halted: false,
  host: "localhost",
  method: "GET",
  owner: #PID<0.596.0>,
  params: %{},
  path_info: ["order"],
  path_params: %{},
  port: 4000,
  private: %{
    PsRbkWeb.Router => {[], %{}},
    :phoenix_action => :index,
    :phoenix_controller => PsRbkWeb.PaymentController,
    :phoenix_endpoint => PsRbkWeb.Endpoint,
    :phoenix_format => "json",
    :phoenix_layout => {PsRbkWeb.LayoutView, :app},
    :phoenix_pipelines => [:api],
    :phoenix_router => PsRbkWeb.Router,
    :phoenix_view => PsRbkWeb.PaymentView,
    :plug_session_fetch => #Function<1.58261320/1 in Plug.Session.fetch_session/1>
  },
  query_params: %{},
  query_string: "",
  remote_ip: {127, 0, 0, 1},
  req_cookies: %Plug.Conn.Unfetched{aspect: :cookies},
  req_headers: [
    {"accept", "*/*"},
    {"accept-charset", "UTF-8"},
    {"accept-encoding", "gzip, deflate"},
    {"cache-control", "no-cache"},
    {"connection", "keep-alive"},
    {"content-length", "353"},
    {"content-type", "application/json"},
    {"host", "localhost:4000"},
    {"postman-token", "70bc9e11-1ef4-493d-a556-cf4876d28bc2"},
    {"user-agent", "PostmanRuntime/7.4.0"}
  ],
  request_path: "/order",
  resp_body: nil,
  resp_cookies: %{},
  resp_headers: [
    {"cache-control", "max-age=0, private, must-revalidate"},
    {"x-request-id", "2lonnum7h1c48rmudk000gu1"}
  ],
  scheme: :http,
  script_name: [],
  secret_key_base: :...,
  state: :unset,
  status: nil
}

So, the question is: Is it possible to receive any json data in GET request body and access it form controller? (Or I have to give up and use POST with JSON body). Please, guide me to the right direction.