We set up a bridge between the Lemmy.world General Matrix room and the Public-1 channel on the Lemmy World discord server yesterday. It’s not perfect as emoji reactions aren’t visible and some minor things like how it handles edited messages but other than that it seems to be working well.
Now people on both chat clients can interact with eachother!
Probably not. But why do you even need to do that? Chat platforms are ephemeral by nature. If there’s anything important that needs to be kept, you should consider a different platform.