Atomstr.data.haus if you have the RSS feed.

But yeah I think you need to be an admin of the telegram to get it work maybe? I tried using this:

https://rss.app/en/rss-feed/create-Telegram-rss-feed

But maybe there is a setting in the telegram group (even though it is Public) I wanted to create a feed from which disabled rss feeds from being made. No idea, not tried it with another group.