Showing HUD elements above NPCs

Hey guys,

I have a problem and hopefully some of you know how to solve it.

After pressing a button in my HUD, I want other elements to appaer above the head of an NPC.
I think the coordinates of the NPC need to synchronize with the coordinates of the Screen.

For the coordinates of the NPCs head, I added a Scene Component flying in front of him. But whats next?

How do I get the synchronization to work?