How to configure zoom on Ardupilot for digital camera

Hi, we are using herelink with Tarot Pepper 10x, it works fine but I dont know to assign appropriate joystick or button from herelink controller to zoom in zoom out. COuld you pls help ?

ALso, is it possible to change mode for drone, for instance, when I press one button I can use wheel for zoom in/out, when I press another button - wheel change smth else

No.