I tried for like 30 seconds and would not find a way to do it. Will try again when I can get into it again (having troubles these days)
Discussion
For Nostr clients like moStard, it just needs to be an XMR address directly in your bio. For me, I literally just copy-pasted it into the main bio area.
Caveat emptor, the number of XMR tippers is few and far between, but it's still nice to have the option!