Because there are too many services offer now on how to add a Telegram bot member on a group or a channel and so far, I didn't find any services that identify a bot in a telegram group or channel.  That is probably a reason that Telegram is a house of scammers and fraudsters because it is easy to fake even a member of a group/channel.

However, this isn't related to your question but I found it an interesting topic on Reddit.  A Telegram bot that can able to show which telegram groups a person is member of.