This is a feature I would like so much, and I don't know why never implemented.
BIAB should be able to send chords to external arrangers like Yamaha ones, as it already does for the Vocalist.
Moreover, midi file creation, for midi files generated with BIAB, should have an option for encoding chord symbols in XF format.
This would enable Yamaha keyboards and Digital Pianos to acknowledge them, showing chord names on their displays and even playing their own proprietary styles.
What a perfect marriage between BIAB and Yamaha keyboards. I think this would be welcome by the whole world of Yamaha users, because at present they (we) have to rely on poor software for that.