How to Add a List of Users to 'Watch Descendants' for a Page - ScriptRunner for Confluence

I’m looking for a way to take a list of users and add them to ‘Watch Descendants’ option for a page. There are built-in scripts to add ‘watchers’ in the traditional sense, but I’m struggling to find an option to add users to the custom ‘Watch Descendants’ option that ScriptRunner for Confluence provides. Is there a way to do this or does any one here have experience creating custom scripts with this in mind?