Interesting idea. I haven't heard of anyone having done this yet, although it is theoretically possible that someone has. There is
Atlas, which has maps for many of the dungeons and
FlightMap but other than that ...
I'd think likely no, because useful map notes for one person aren't necessarily map notes that another person would care about. There would also be the problem that person A is using the map mod from CT, and person B is using the map mod by "whoever", and the two aren't compatible. But as I said, it is still possible that someone has, I'm just not aware of any.
Anyone else ever see one?