code: def to_map_with_default(value, default_value):
          
          result = JsonConverter.to_nullable_map(value)
          return result if result != None else default_value
docs: Converts JSON string into map object or returns default value when conversion is not possible.
  
          :param value: the JSON string to convert.
  
          :param default_value: the default value.
  
          :return: Map object value or default when conversion is not supported.