UMG: How to make an arrow that points to an object in-game?

I have an arrow graphic set in my HUD using UMG. I want to have the arrow point at an object at all times in the game. I thought I would be able to accomplish this with some kind of bind on “Render Transform > Angle” but there doesn’t seem to be a way to add a bind to it? I’m sure this has to be possible somehow. Any ideas?