This is from memory so it may be a little inaccurate but you'll get the general idea.
Go into the Profile ->options ->Controls ->Layouts (with a grayed out custom layout option underneath). This will take you to the various gamepad configs and there's an option at the end for custom/PC, select that one.
When you go back into the control options the Custom Layout option that is normally grayed out should now be selectable, go in there and you should be able to map the functions to the buttons. There's a bug that means the zoom button won't work though. (I think)
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