Load/dump individual message fields
        :param msg:
        :param fields:
        :param field_archiver:
        :return:

async def message_fields(self, msg, fields):
        """
        Load/dump individual message fields
        :param msg:
        :param fields:
        :param field_archiver:
        :return:
        """
        for field in fields:
            try:
                self.tracker.push_field(field[0])
                await self.message_field(msg, field)
                self.tracker.pop()

            except Exception as e:
                raise helpers.ArchiveException(e, tracker=self.tracker) from e

        return msg