no documentation on how to use environment variables to configure Azure Cloud Storage based authentication

On https://help.sonatype.com/repomanager3/nexus-repository-administration/repository-management/configuring-blob-stores#ConfiguringBlobStores-AzureBlobStore it states:

There are three methods of gaining access to the Azure storage account from Nexus Repository:

• Use a secret access key supplied by the Azure storage account.
• If you're running Nexus Repository on an Azure VM, you can use System Managed Identity access.
• Use environment variables.

Problem

There are no documentation on how one is to use env. variables to configure azure storage authentication with our product, even though:

• we mention it is supported
• the blob store UI exposes an option to choose that

Expected

Document any and all env. variables that allow configuring this authentication method ( especially per blobstore ( in the case of multiple azure blob stores ) ) . Point to external facing Azure documentation as appropriate as well.