Unfortunately, no, no such platform exists.

The closest site I’ve seen getting to this was https://github.com/ZorrillosDev/watchit-app but their website seems offline for some reason.

Except tox’s graphical clients aren’t maintained anymore

Put simply, a bot that interfaces with external services and replicates messages to/from a Matrix chat. The software is at matrix.org

Which bridge did you use, if I may ask?

Maybe try a Matrix bridge?