Thanks for linking that! I agree this is a very different request. That one is requesting that Plex identify different cuts of the same film, which is something that TMDB (Plex’s metadata source for films) does not generally do. Having worked with TMDB on my own projects I know this would be prohibitively difficult, which is probably why that request has remained unresolved for over six years.
This request only concerns the display of data that Plex already has. Adding a column to the existing menu for filename is a much simpler proposition.
Edit: Just to add, I’ve created a quick mockup of what this could look like:

Simply concatenating the filename to the end of the string would solve all my woes