Generating REST API docs by Swagger

I have REST API project for which I need to generate documentation.

I’ve looked into phoenix_swagger | Hex . However, as I’ve found out, it requires adding Elixir code right next to each API function:

 swagger_path :index do
    get "/api/users"
    summary "List users"
    description "List all users in the database"
    tag "Users"
    produces "application/json"
    response(200, "OK", Schema.ref(:UsersResponse),
      example: %{
        data: [
          %{
            id: 1,
            count: 42,
            email: "some email",
            name: "some name",
            private: true,
            profile: "some profile",
          }
        ]
      }
    )
  end

  def index(conn, _params) do
    users = Users.list_users()
    render(conn, "index.json", users: users)
  end

This will greatly litter the code where it’ll be unnecessary, in my opinion.

Is there other Elixir Swagger library which is up to date and usable? Or how else will I generate the REST API docs?