Monitoring NTP server status on local Pi

Is there an integration I can use on HA to trigger when certain entries appear in a server’s journald log?

I have a Raspberry Pi with a GPS hat set up as a precision time source. However, the satellite lock has had problems, and I’d like to be notified if the GPS lock disappears for a substantial period of time.

I’m currently using chrony as the time source, and chrony writes its log entries to journald, so it looks like I need to monitor that.

If there’s something built in, then that would be acceptable as well.