@billbonkiom , rescaled mapping not available yet.
In the meantime, try using a physical loopback so that you can transform/rescale the CC values before they get to the mapping target (in the OP’s example, flipping 0~127 to 127~0).
I just mentioned it in a PS here: Midi mapping Toggle
(Originally described in a video by synthmata, I think. I use it a lot)