I think you should set input to linear srgb and output to srgb/rec709 output display transform if you want ACES DRT to be correctly applied to editor, unless you use ACEScg textures and lighting everywhere (but I’m still not sure this is the correct setting even for the case with ACEScg textures and lighting).
I’m not at my PC now, so I can’t check the exact names.
Oh, I got you wrong, sorry!
I don’t remember how to apply it to play mode, need to reach my PC first.
Sorry again! I was wrong thinking this is possible! I’ve just applied it to viewport and to Movie Render Queue from Unreal 5. But looks like it’s impossible to apply it in Play mode. I hope it’s just me who can’t do it and this is actually possible.