ah, the beauty of custom properties.
What I've done is have a custom property called "alertEmails"
It is populated with our Operations email, the monitoring team email and the system owner's group email.
The alert then has in the TO: ${alertEmails}
OR
you could have a department/owner custom property. create a group email that matches the department name; and in your alert you could do ${dept}@mycompany.com
all sorts of options