For the Turbo version of the Baron it is an LVAR (“BKSQ_MIXTURELEVERPOSITION_1” and “BKSQ_MIXTURELEVERPOSITION_2”) - screenshot from SPAD.NEXT:
For the Bonanza A36TC it’s “BKSQ_MIXTURELEVERPOSITION_1”.
In the in game control settings it is mixture 1 axis and mixture 2 axis (-100 to +100)