JVC DILA Aperture numeric value

I use two different lens aperture settings on my JVC projector (2.35:1 screen, Panamorph lens) depending on if I am using 2.35 width or 16:9.

The built in command set for JVC devices includes an Aperture command, but I don’t see any way to input a numeric value. The projector accepts values from 0,-1.-2,… through -15.

Maybe I am missing something. I would like to be able to send custom values to the projector with my commands to change viewing aspect ratios.