Planner notification function

I would like the @ function added to either the notes or comments field in Planner.

If I have a task which there are 5 users attached. I would like to @ a user to get their attention regarding a completed tasks or checklist item.

The send function only sends a message to whole group which is not something I wish to do.

This function is a needed function to keep people using Planner rather than finding a platform that has this functionality.

Regards