you can make a PostProcessMaterial (how to do that link)
in the postprocessmaterial you can for example multiply the scentexture color with the scentexture SSAO. this method gives you more control (on how much to apply options still in post process volume), but I think the unreal way to do it is by using the cudemap in the postprocess volume (in the last demo “matinee” fight it was done this way).
from above:
So if you fake GI with point lights, its again direct light so the AO gets masked off in those areas = its not visible.
yeah this problem remains, but the idea with the cudemap is to fake this lighting.
If you dont get it to work I can provide an example with the postprocessing method.