I have not seen a single telegram client (other than my own) that has a message filtering function.

[Vponed]

The scourge of the telegram is spam, unnecessary meaningless messages.
"My own" client, it is very loudly said, but by writing a page of code, he filtered all incoming messages and gave a signal only to the necessary ones. Your signal for every interesting user, and not for everyone in the chat! But I'm not a programmer, and this is just a hack. In your client, such a function would look great. (For example, as a setting for a chat, or a group to track certain users and assign them their own signals. And of course, ignore everyone else. Also, a filter by tags would be in the topic)
And it would be great to promote "a little-known client that no one trusts." People really need it!