Hi NathanKhan,
I can’t answer you’re question that well but I have spoken to a local freelancer who has imported Octane materials into Unreal. Yet to try myself but still keen to try. I do think the workflow is to import octane materials into Quixel mixer and then on into Unreal.
I think the point of using Octane in Unreal is for the Unreal users wanting to get better results for stills.
I would like to see Octane work it’s magic in real-time inside Unreal one day. Materials are so much easier to create.