Alarm if driver is not mapped to driverUniqueId

I have a computed attribute to show driver name.
Attribute example: driverUniqueId ? driverUniqueId : null
It is working as expected but I would like to create an alarm if a device move and driver is not added to drivers list and mapped to driverUniqueId.

Is it possible to do with computed attributes.

Not possible. You can't access driver list from computed attributes.

Thanks Anton, is it possible by changing code, if yes I will send an email.