Graph API - Get Schema Extension attributes for Azure Groups

Question

Is it possible to get all schema extensions associated with a group using the Graphi API? I have tried various filters in group (using select clause) but no luck.

I can get all schema extension types by querying

https://graph.microsoft.com/v1.0/schemaExtensions?$filter=startswith(status,''Available'')

I picked one of them which applies to group, and ran this:

https://graph.microsoft.com/v1.0/groups?$select=myExtensionAttrib

This then gives me a list of odata.id, but they have a v2 URL, not sure how to proceed from there (masking the UIDs)

https://graph.microsoft.com/v2/{someUID}/directoryObjects/{anotherUID}/Microsoft.DirectoryServices.Group

Is this the right way or is there some other way to get extension attribute values for a group?

Thanks