I was talking about using Unlit materials that fake self shadowing by applying a bias opposite of a Vector3 (which simulates a sunlight direction). This method doesn’t apply shadows from meshes to other meshes however, and requires most if not all of your content to be designed with it in mind.
Instead I’d recommend MixedReality Graphics Tools from Microsoft! It’s a plugin that gives you a much cheaper way to do lighting, and it works on Quest: GitHub - microsoft/MixedReality-GraphicsTools-Unreal: Graphics tools and components for developing Mixed Reality applications in UE4.