If the user doing the update is the same as the user you would like to be added as watcher for the issues you can do bulk update and and select "Watch Issues" option.
https://confluence.atlassian.com/jiracoreserver072/editing-multiple-issues-at-the-same-time-829092790.html
Check also this discussion and the add-on suggested
https://answers.atlassian.com/questions/151799
You can create a role - we have 'project-watcher', then assign users and or groups to that role in the project admin and add the role to the project notification scheme so that they are notified of the same things as watchers.
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