If you check "System - Configuration - Backups" you can check the restore areas, there Dashboard exists. So I think you could import it from a backup.It also exists for the XMLRPC Sync for HA.There is still some tweaking done to make the UX better. Check out github where there are a few open Dashboard tickets. Feel free to add an issue there if you would like something improved, it makes it easier to track.https://github.com/opnsense/core/issues
If you check "System - Configuration - Backups" you can check the restore areas, there Dashboard exists. So I think you could import it from a backup.