@derek, thanks for the reply. I did get some feedback on the Affinity forums as to how to get it working in Photo. See the post here from James Ritson. You basically need to add a procedural texture in order to reverse the gamma to 2.2 and then you view it through the ICC profile display transform after converting from scene_linear to out_srgb in your OCIO adjustment layer. It was the procedural texture trick that was the ah-ha moment for me as the Levels adj layer will only let you boost the gamma to 2. It should make sense if you check out the post.
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