code: def _scalar_field_to_json(field, row_value):
      
      converter = _SCALAR_VALUE_TO_JSON_ROW.get(field.field_type)
      if converter is None:  # STRING doesn't need converting
          return row_value
      return converter(row_value)
docs: Maps a field and value to a JSON-safe value.
  
      Args:
          field ( \
              :class:`~google.cloud.bigquery.schema.SchemaField`, \
          ):
              The SchemaField to use for type conversion and field name.
          row_value (any):
              Value to be converted, based on the field's type.
  
      Returns:
          any:
              A JSON-serializable object.