How to make virtual joystick trigger thumbstick button press/release events

I was wondering if is there any way to customize the default virtual joystick to trigger thumbstick button events (press/release).

I confess, I kopirnul question from another user, but it has not been answered, and I needed this functionality is critical.

I tried to set umg button (as well as image, layers etc) over thumbstick (with different zOrders), but can’t catch press or release event to thumbstick through umg elements