How to check if a Tap is on a UI image?

With the old Input system, I would just use a Button with OnClick or an Event Trigger with PointerClick.

I am now using the new Input system and I turned on Touch input simulation because I'm making an Android app.

The problem is now, that when I play in the editor and use a Button with OnClick or Event Trigger with PointerClick, the event is registered twice. Once by the mouse and once by the Touch input simulation.

So I want to create a system that only checks using Tap. I created a Touch tap event (see screenshot).
But then how do I actually check if this Tap is on the button that I created?

My buttons are on an Overlay camera.



Should I write an InputManager script that checks for FirstTouchTap and then uses a Raycast to check which UI image it is over?
But then how do I link that to trigger the script function that I want? Because it used to be very simple to use Button and OnClick and then a reference to the script and function I want to call. But not sure how I would do that setup if I just have one InputManager script that deals with all taps.