Not without code (which you can't do in OnDemand)
The closest I can think of - add a field of type "user picker" and then change your notification scheme so that it sends mail to anyone in that field. Not quite what you're asking for, but it will have the same effect on mail, just not add them as a "watcher"
Statuspage customers logged more than 194 years of collective incidents in 2018. That’s a whopping 87% increase from the 104 years logged in 2017 , and we aren’t even through December yet....
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