json_schema: {
      "$schema": "http://json-schema.org/draft-07/schema#",
      "definitions": {
          "MyMap1": {
              "additionalProperties": {
                  "$ref": "#/definitions/MyType"
              },
              "type": "object"
          },
          "MyMap2": {
              "additionalProperties": {
                  "type": [
                      "string",
                      "number"
                  ]
              },
              "description": "The additionalProperties annotation should be ignored",
              "type": "object"
          },
          "MyType": {
              "type": "object"
          }
      },
      "properties": {
          "map1": {
              "$ref": "#/definitions/MyMap1"
          },
          "map2": {
              "$ref": "#/definitions/MyMap2"
          },
          "map3": {
              "$ref": "#/definitions/MyMap2"
          }
      },
      "required": [
          "map1",
          "map2",
          "map3"
      ],
      "type": "object"
  }