Set the chat as a system chat.
        Only set for channel-level and group-level system chats.

        Returns:
            EFBChat: This object.

def system(self) -> 'EFBChat':
        """
        Set the chat as a system chat.
        Only set for channel-level and group-level system chats.

        Returns:
            EFBChat: This object.
        """
        self.chat_name = "System"
        self.chat_alias = None
        self.chat_uid = EFBChat.SYSTEM_ID
        self.chat_type = ChatType.System
        return self