def METHOD_NAME(self, sensor, column_defs):
    field_name = sensor.display_name
    display_name = '{} ({})'.format(field_name, sensor.data_logger.display_name)
    column_defs[display_name] = {
        'field': display_name,
        'displayName': display_name,
        '_filter_type': 'reading',
    }
    return display_name