The “see reference” link is a great idea. It’s not actually all that useful in practice because the reference has almost no information. But, in principle, all you’d have to do is beef up the documentation.
The thing is that it only appears when you’re building an expression. If a sentence is already built, and you hover over the sections in it, you don’t get the “see reference” popup.
For example, here I’m trying to dig through a working example of a multiselect list to find out how to build it myself. When I hover over the sections in this advanced filter they just hilite white; no “see reference” popup although that’s exactly the perfect time for a “see reference” popup.