Pixhawk 4 mini aux1

hi,

my set up : openhd fpv Tx and Rx
pixhawk 4 mini
cam with pan and tilt ( on the tx)

config pixhawk : airframe : wing with aileron
prof
throttle
aux1
aux2
aux3
my problem : on the pixhawk 4 mini there are no aux output.
i would like to control my cam with th channels 6 and 7

                   How can i do ? 

thanks.
Pascal