Summary Number of imported Users vs. Enrolled Users

**Is your feature request related to a problem? Please describe.**
No

**Describe the solution you'd like**
Summary Number of imported Users vs. Enrolled Users - I'd like to see how many Users are not enrolled and I'd like to filter them to trigger new enrollment Mails simultaneously. Or even better: enrollment reminders.

**Describe alternatives you've considered**
None

**Additional context**
Users imported via LDAP.