def METHOD_NAME(self,
                    raw_anno_info: Tuple[Optional[str],
                                         str]) -> Union[dict, List[dict]]:
    """Parse raw annotation to target format.
    Args:
        raw_anno_info (str): One raw data information loaded
            from ``ann_file``.
    Returns:
        (dict): Parsed annotation.
    """
    data_info = {}
    img_key, text = raw_anno_info
    data_info['img_key'] = img_key
    data_info['instances'] = [dict(text=text)]
    return data_info