Replace AlpineJS click-show using LiveView assigns on a form component

form_component.ex

defmodule AppWeb.ExampleLive.FormComponent do
  use AppWeb, :live_component

  alias App.Examples

  @impl true
  def update(%{example: example} = assigns, socket) do
    changeset = Examples.change_example(example)

    {:ok,
     socket
     |> assign(assigns)
     |> assign(:changeset, changeset)
     |> assign(:help_message_state, example.has_help_message)}
  end

  @impl true
  def handle_event("validate", %{"example" => example_params}, socket) do
    changeset =
      socket.assigns.example
      |> Examples.change_example(example_params)
      |> Map.put(:action, :validate)

    has_help_message = case changeset do
      %{changes: %{has_help_message: has_help_message}} -> has_help_message
      %{changes: %{}} -> example["has_help_message"]
        _ -> false
    end

    {:noreply, socket
    |> assign(:changeset, changeset)
    |> assign(:help_message_state, has_help_message)
    }
  end
  # ...
end

form_component.html.leex

<h2><%= @title %></h2>

<%= f = form_for @changeset, "#",
  id: "example-form",
  phx_target: @myself,
  phx_change: "validate",
  phx_submit: "save" %>

  <div>
      <%= if @help_message_state do %>
        <div>
          <%= label f, :help_message_mode %>
          <%= select f, :help_message_mode %>
          <%= error_tag f, :help_message_mode %>
        </div>

        <div>
          <%= label f, :help_message %>
          <%= text_input f, :help_message %>
          <%= error_tag f, :help_message %>
        </div>
      <% end %>
    </div>
    <%= submit gettext("Guardar"), phx_disable_with: "Guardando..."%>
</form>