Possibility to mention users in a Checklist

[dantefromhell]

It would be great if users and/or groups can be mentioned using the @username syntax in a checklist.

To give an example scenario
After creating an updated documentation I want to track users who opted in testing it via a common task. The task would include one checklist item per user.
If mentioning of users would be possible, this would create a notification automatically to each user.