How to pass a comment widget's mentions partner as input for an action

I would like to send email notifications to the mentions in the comment widget. However, the default notification does not provide sufficient content, so I would like to use customized content for the notification. Therefore, we would like to use an action to do this. Is it possible to pass the comment widget mentions as input for the action?

I don’t think it is supported.
What you could build though is a workflow where comments are entered via an action form (instead of using the comments widget) and this could trigger notifications on Actions (to be configured in OMA).
Since you can’t use mentions directly in text in action forms, you would need to think slightly differently and thus have a property containing mentioned_user_id (that could be a dropdown a user chooses from in Workshop for instance). The mentioned_user_id could then be the recipient of the notification.

Hope this helps,
Max