Disabling one direction of the radio channel using Mavlink

Hi all,
I need help stopping one radio channel, for example, the crossfire, the H16, or Herelink using Mavlinkcommand. I know how to disable the complete channel, but what I need, is to disable the single direction of the channel. For example, ch.2 is the Pitch channel and it can send forward and backward commands. I need to stop only the forward one for example.

Many thanks in advance