"Since the UJAM guitars allow different voicing of chords, I doubt that they've sampled all the possible chords with all the possible voicings. I certainly wouldn't."
The chord types recorded are limited to these else it would allow all chords:
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=400763#Post400763

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Look at Silk v1 size without the sample set (phrases only):

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As I said I can create a VST instrument from each RealTrack/RealDrum that will work the same way UJAM works, but why do I have to do this, why can't PG do it ? I already uploaded some sfz examples using the wma source files that worked the same way.