How to detect widget at a screen position?

Hello
How to detect widget at a screen position?
For example, i’ve got a scrollbox fill all the screen containing other widgets. How to know which widget is lets say at center of it?

You talk about Slate or UMG?

Scrollbox children are custom widgets, so UMG
Maybe there is an analog to shape trace for 3d? Just to know what is under the center of the screen for example