While this is possible with Fusion 12.0 and macOS 11.0, there are many critical bugs fixed in Fusion 12.1 and macOS 11.1, so we recommend using those versions and newer.
While the feature isn’t quite up to our quality bar just yet, we think it’s far enough along to share with folks so we can gather feedback.
With macOS Big Sur, Apple has given us a new set of features that will allow macOS virtual machines to achieve something long sought after: Accelerated 3D Graphics with Metal! Enabling Metal Graphics in macOS Big Sur VMs