User Interaction in new spectator view 4.17

I’m testing the new spectator view and am able to set the render target of my UMG widget as the texture in the spectator view. But I also would like the spectator to be able to interact with the widget using the mouse.

Would that be possible in version 4.17

Can you show me the way to Set the UMG widget?I want to learn about it .thanks!