Render Feature that does post-processing on UI

Graphics Render Pipelines
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Hello! I would like to run a post-processing effect that happens after a UI is rendered with Canvas (Screen Space - Overlay).

I have a render feature that works, but doesn’t seem to do anything when queued at “After Rendering.”
The feature is basically exactly the same as the URP sample: BlitWithColor.

Is this possible? Or must I use a camera stacking solution? (This game also uses the PixelPerfectCamera but the UI is high resolution.)