Custom journalctl logs

SYSTEM INFORMATION
OS type and version Linux Ubuntu 22.04.4
Webmin version 2.105

When I go to the System Logs Viewer I can see there are a few options for journalctl tho I haven’t been able to find a way to add my own custom options for journalctl eg. “journalcl -b CONTAINER_NAME=name”.
I am not sure if it’s me but I can’t find a way.