Creating Users when importing Extensions with Bulk Handler

Using version: 10.13.66-7
Since “Bulk Extensions” is deprecated, I’m trying to import extensions and users with the new Bulk Handler. However, I have run into the following problems:

When importing new extensions with Bulk Handler. corresponding users are not automatically created. Is this possible?

I can import users with Bulk Handler and then import extensions and they do get linked; however the users are not added to the “All Users” group.

Any help greatly appreciated.