json_schema: {
      "items": {
          "additionalProperties": false,
          "properties": {
              "value": {
                  "pattern": "^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$",
                  "type": "string"
              }
          },
          "required": [
              "value"
          ],
          "type": "object"
      },
      "type": "array",
      "_uniqueItems": true
  }