Show the fields being looked up in the field lookups menu

It would be great when we click on field lookups in the menu if we could see what fields in what tables we were actually looking up. I can put a heading in my report, but it might not be the same as what I'm looking up. For example, I have a field in a somewhat complex report that is Vendor Name. This could come from a few different tables that re related to our job planning lines table. If this menu option could show that by highlighting it or displaying some data similar to the range lists it would be really helpful.