Feature Request: UbuntuCore20 - snap set command to configure journald

Request:

Similar to documented [1] snap set commands, could there be a configuration parameter available to limit log storage to 512MB?

[1] - https://snapcraft.io/docs/system-options#heading--journal-persistent

Workaround used (but would prefer a snap set command for this functionality):

Clean the logs to the requested size utilizing the journalctl vacuum capabilities, for example:
journalctl --vacuum-size=512M

If you have access to edit /etc/systemd/journald.conf file you could set the parameter SystemMaxUse= to 512M, however in Ubuntu Core this may be read-only and unalterable. If that is the case use a systemd timer or cron job to manage the file size with the journalctl command provided above.