iTunes does not have a dynamic range display function built in (that I’m aware of, I stopped using it a couple years ago). The images I posted here are screencaps of a program called JRiver Media Center.
JRiver is superior to iTunes in every way imaginable except one - it isn’t free. JRiver costs $50. But with its feature set I happily pay the license fee.
In addition to audio, JRiver also plays back all video files, can organize and keyword tag photos, documents, podcasts, ebooks, and almost any other file type you can throw at it. It’s built for audio, but it does so much more.
That said - if you want to look at the dynamic range for various releases/pressings, there is an online database here: http://dr.loudness-war.info/
But that database is all user supported, so every entry there was submitted by a music fan, meaning obscure or new titles/pressings won’t be there for a while, if ever.
The database site linked above also offers a tool that will analyze your audio files on your computer for you, but I believe it only reads .wav files, not lossy mp3s or Apple’s aac format (the software assumes that if you care enough to know the dynamic range, you care enough to use lossless media).