Help using JoyToKey for zoom view

[SharpeXB]

Could someone please help explain how I can accomplish the following task with JoyToKey?
I would like to assign the Y axis of my CH pedals to the FOV axis in the game. To do this I need to assign the mouse y axis to the CH pedal Y axis and also assign the mouse button 5 (mapped to “Hold to Adjust FOV” in the game) to the same CH pedal input. Hopefully then pressing down on the toe axis will zoom the view in and out. I have JoyToKey downloaded but have trouble understanding how to set it up.
Thanks