How do I get my gameobject to appear in front of my UI?

I'm working on a examine object mechanic in HDRP.
When you examine the item everything else gets darker except the object your examining (I have a transparant black image which covers the whole screen).
But I have been struggling actually getting the item to appear in front of the UI.

Someone on reddit suggested using a custom pass because that worked for him in URP. Sadly I couldn't get that to work.

Then I came across the graphic compositor which I kinda got it to work, with a second camera. But sadly the second cam also showed the sky in the main camera and had a pretty big impact on performance (±20 fps drop).

Is there any way to get this right?