Unreal Engine 5 doesn't offer detailed native groom settings, but Epic Games has made a variety of console variables available for advanced tweaking. Argentum Studio has leveraged this by developing their in-house Hair Cinematic Tool, which allows one to work with all the internal settings and create higher-quality renders.
According to the developers, Hair Cinematic Tool allows you to fine-tune shadows, lighting, and rendering methods for cinematic-quality hair simulations directly in the engine. Here are the results you can achieve with the tool: