IIRC, Wyzard256 was planning to add that feature in a future update to RefScope.
RefScope is for working with things that have RefIDs and FormIDs, so adding features for menu info would be a step in a very different direction. If there's useful information to be had, I wouldn't mind adding it, but I know very little about the game's menu XML at this point so I wouldn't say I'm planning on it. However, I've been wondering in the back of my mind whether it might be possible to use custom menu XML to build a better UI for RefScope than the game's messageboxes, so I'll probably look into it at some point.
For now, I believe Kuertee's "Actor Details" mod does what you want, showler. Its main purpose is providing info about an actor (as the name implies) but it also tells you the path of the UI element that it's activated on.