"- the *.txt file could be set in the RT folder" and a button in the RealTrack picker will open it, you can then paste it in the User Memo box of that track.
A list of chords used in the Holds would also help.

If they don't get around to doing this, someone who's enthusiastic can open BB All Chord.SGU
enable Chord Output in Prefs > Complex Chords, Write to MIDI file
save as MID
open in RealBand
in the RealTrack picker list by RealChart
generate track and RealChart
open the RealChart and BB Chord Output track each in their own window.
Or do it by ear if you have a good ear.
Then when you have done all that have a look what hold the track uses in the Hold column, bb\RealTracks\Library\Holds
play through them.
Put the correct playing chords and the available Holds in a txt for each RT then upload them.