We are going to support Windows Server 2022, but I can't give you an ETA now - we have just a few users asking about that. If we see a greater demand in WS 2022 we might increase the priority of this item.
Saying that, there are a few options to have builds on Windows Server 2022 today:
1) We could setup a custom cloud for your account with an image based on Windows Server 2022. It's going to run on GCP and it's a paid add-on with per-minute pricing. GCP doesn't support a nested virtualization in Windows image though, so WSL will be working inside VM, but Hyper-V not.
2) If you need Hyper-V inside VM then you can configure BYOC on Azure which supports nested virtualization on certain instances.