By using the Links Hierachy add-on this is pretty easy:
1. From the main issue detail view on JIRA select the Links Hierarchy tab
2. Apply the filters and expand the hierarchy until it shows what you want to watch on JIRA.
3. From the add-on More... menu > Export to JQL
4. From the issue advanced search view: Tools > Bulk Change > ... > Watch Issues > ...
Please, watch this video showing a similar process in order to make a bulk change:
Hope this helps.
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