In theory that should be no different from an in-place upgrade on any other vSphere platform (on-premises, VMware Cloud on AWS, IBM Cloud, etc)
However, AVS support comes from Microsoft, not VMware - so it would be best to check with Microsoft.
-------------------------------------------------------------------------------------------------------------------------------------------------------------
Although I am a VMware employee I contribute to VMware Communities voluntarily (ie. not in any official capacity)
VMware Training & Certification blog
