New Automation trigger "When 'Watchers' field is updated"

Client would like watchers field to be made usable for triggering automations when this field is updated. Currently the watchers field is not exposed as a normal field in Jira and does not fire an issue updated event when it's modified, which is why it doesn't get triggered.

Client would like for there to be a way to have this field fire an issue updated notification so that an automation trigger can work with it.