json_schema: {
      "$schema": "http://json-schema.org/draft-07/schema#",
      "title": "choices",
      "description": "I've got class.",
      "type": "object",
      "definitions": {
          "item": {
              "type": "string",
              "enum": [
                  "one",
                  "two",
                  "three",
                  "marvelous breaking changes",
                  "GA",
                  "FL"
              ]
          }
      },
      "properties": {
          "value": {
              "type": "array",
              "items": {
                  "$ref": "#/definitions/item"
              }
          }
      }
  }