Is there a way to make a viewport widget be affected by post process materials?

I’d like to make an in-universe video overlay affected by the post processing materials I’m using, but setting up a 3d widget is a mess with too many caveats to be worth it. Is there any way to simply add a widget to my viewport but tell it to draw before post effects are applied to the whole screen?

Only to make it a 3d widget. You could attach it to player’s camera. It has own limitation though. Like unable to exclude from camera DOF.

Creating 3D Widgets

You also could vote for PP enabled UMG feature: UE-16058