I don't think it's already available.
A button to duplicate the current FOH mix in a chosen AUX output. From there, the user can add/subtract 'Me' or anything else.
I guess it would have to assume that everything is pre-fade send, which is usually true for a monitor mix.
It can take a lot of effort to 'start' with a FOH mix in your in-ears but it can be a good place to start.
Thanks for listening
Mixer Model: XR18
App Version: Pro