discourse-custom-wizard/spec/fixtures/actions/open_composer.json

{
  "id": "open_composer_action",
  "type": "open_composer",
  "title": [
    {
      "type": "assignment",
      "output": "Title content",
      "output_type": "text",
      "output_connector": "set"
    }
  ],
  "post_builder": true,
  "post_template": "Post content"
}