json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "Youtube video",
      "type": "object",
      "properties": {
          "name": {
              "type": "string",
              "readonly": true,
              "default": "youtube",
              "options": {
                  "hidden": true
              }
          },
          "src": {
              "type": "string",
              "description": "The youtube embed url. Example: https://www.youtube.com/embed/8X1eao17Lok"
          }
      },
      "required": [
          "src"
      ]
  }