Automatic Irregular Heart Beat Notification (AFib)

I know that Garmin can notify autmatically when your heart rate is above or below a threshold.  Also, am familiar with the new ECG feature. But, can watches with ECG feature notify you when an irregular heart beat is detected automatically, as a cue to then perform a proper ECG manually?

I have Afib, and I need to have continuous monitoring of abnormal heart beat patterns as an alert. I believe Apple watches do periodically measure heart beat to alert wearers to perform a manual ecg.

Hope this makes sense.