{
  "$defs": {
    "FieldName": {
      "pattern": "^[a-z][a-z0-9_]{0,62}$",
      "type": "string"
    }
  },
  "additionalProperties": false,
  "properties": {
    "fields": {
      "anyOf": [
        {
          "items": {
            "$ref": "#/$defs/FieldName"
          },
          "minItems": 1,
          "type": "array"
        },
        {
          "type": "null"
        }
      ],
      "default": null,
      "title": "Fields"
    }
  },
  "title": "ExpectedParams",
  "type": "object"
}