Simple enough for me to add. Download and install the latest beta version
https://github.com/rsjaffe/MIDI2LR/releases but before starting lightroom, move the files attached to this message into MIDI2LR.lrplugin to replace the two files there. This adds the 9x16 crop to the database and enables the action. For other users, they can do the same to get that ratio now, or wait until the next release.