Shell command to assign "Additional Store Owner" to all users

Hi all!
I am looking for a shell command to assign an "Additional Store Owner" to all my users.

The reason is, I want to use Mailstore Server to archive all mailboxes with a single user.

I checked the "grommunio-admin-user" cmdlet. I can see optins to set/modify the delegates and sendas values, but not the store-owner.

Any ideas are welcome 🙂

Thanks!

Christoph

gromox-mbop foreach.mb echo-username | while read -r username ; do grommunio-admin exmdb "$username" folder grant 0x9 some@mail.tld storeowner; done

That worked like a charm! Thank you very much!
Thx for the links to the scripts... Lots of interesting things in there 🙂