I have a similar usage of sharing issues and I use a free plugin which track each share action. Additionally you can grant a share view to non users (of your JIRA). Maybe this free plugin would be a nice solution for your request?
Hint: It grant a dynamcially view, so there is no need to refresh active shares
The mentioned user gets an email that he/she was mentioned in a comment, even if the user is not assignee, reporter or watcher. So, it's the comment that is tracked, as you wrote, but through mentioning a user you can trigger an additional email to this user.
Does the user have to have a Jira account, or can you mention an external email address?
If a Jira account is required would an example of this look like this: Blah blah blah "@jmedina' blah blah blah. Can the mention block appear anywhere in the comment?
If external emails allowed, does how would that look?
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