Meta Horizon to Unity - lighting in world

Were you able to figure it out? I'm wondering if Bloom is also possible in VR

Bloom is possible, but it's especially difficult because the usual process requires reading the back-buffer after rendering your scene to capture the color for processing. That's very bandwidth-intensive, and so you'd be severely eating into your rendering budget. Separately folks have argued that bloom doesn't "make sense" in VR, because it's a camera effect and theoretically you're in there without a camera, looking through your "eyes" instead, but I've prototyped relatively standard bloom (Epic style separable multi-band) and I think it looks great as an artistic choice.

The problem is just performance: it's not really that practical on current hardware. Practically speaking, my understanding is most games fall back to cards and textures to produce glows in VR games.