I wondered about this before but apparently the Telegram client is terrible spaghetti code under the hood, making these kind of ideas not feasible.
You might like Monocles Chat though, which is an Android XMPP client with a somewhat nicer looking interface.
There is also the work in progress Moxxy client, which is a from ground up new XMPP client written in Flutter. It seems to take some interface inspiration from Telegram, but to be honest, it isn’t anywhere near to be fully usable and development has been slow in recent months.