https://www.virtualmin.com/documentation/developer/cli/list_users

virtualmin list-users --all-domains --email-only | egrep -v -e abuse -e hostmaster -e postmaster -e webmaster > /tmp/virtualmin_users.txt

https://www.virtualmin.com/documentation/developer/cli/create_admin

Virtualmin → Select Domain → Administration Options → Manage Extra Admins → Add a new extra admin

From the Virtualmin control panel:

Virtualmin → Select Domain → Edit Users → Add a website FTP access user

https://www.virtualmin.com/node/33013

Rights assigned to all users:

/etc/webmin/webmin.acl