Riccoboni,
+1
I believe there are actually 3 parts to your request.

A) MIDI Phrases. Take a look at what I described here:
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=882175#Post882175
Engine to reharmonize is baked into BIAB, but for some very strange reason can't use 3rd party MIDI phrases. Considering BIAB has all the bones already in place, it shouldn't be a hard task.

B) Voicing of MIDI chords. Excellent idea!

C) Progression library / assistant. I've asked for that too in the past. I am surprised it wasn't done 10-15 years ago. This one would make an excellent feature by itself.