Account Admin can link Workspace with Unity metastore, if it is linked, he can grant himself Admin privilege to this workspace.

So most likely you won't get it. You could try to create dev tenant and connect your subscription to dev tenant ( it is free) but I don't know if this will work with MSDN subscription.

You can share this instruction 

https://learn.microsoft.com/en-us/azure/databricks/data-governance/unity-catalog/create-metastore

But if there is existing metastore in your tenant  , probably you should just ask to link your workspace to existing and get access to some kind of sandbox catalog, there are many ways but this is only put to your admins.