Unfortunately, capturing a performance on a MIDI piano (which is how the piano RT was most likely captured) isn't going to distinguish between what is played by the right hand and what is played by the left hand (which is what I think your real question is, since none of the notes presented would normally even be in the bass clef). In a dedicated notation program, you could temporarily make the bass clef a treble clef, and split between left/right hand, but would have to do that manually. BIAB isn't going to do that, though.

If I saw the above, with nothing in the bass clef, but those long reach chords in the treble clef, I would just automatically split the playing between L/R hands, even though there's nothing in the notation telling you to do so explicitly,

John

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