distinguish between task assignments and task "watchers"

Description - This is a function I've seen on Click Up, where you can distinguish between task assignments and task watchers. The watchers would be on there for visibility to upcoming dates, monitor their employee's work, or to monitor progress in case their support is needed. 

Why is this feature important to you - We often have multiple assignees on a task for milestones, especially in the case of review meetings, or final approval tasks. As we all know, having multiple assignments on tasks does not function well in Workfront, but creating a bunch of duplicate tasks isn't a great solve either.  Distinguishing between assignment types would allow us to clearly identify who is responsible for a task, and who needs to be informed. 

How would you like the feature to work - in task assignments, select if assignments are responsible or watcher/informed. I think it would make most sense to default to a regular assignment but have the ability to edit in the advanced assignments function. Ideally people would get upcoming task notifications but not late task notifications. I would want them to be able to filter or group a worklist or report by task assignment type. Watcher/informed tasks would not count in the user's planned hours.   

Current Behaviour - all task assignments treated the same, planned hours split evenly between all assignees.