Putting a "to-do" list in your work when @mentioned

When user is mentioned in a thread/updates and there is a task for them (not suitable to be an assignment in the row), user A would like to personally manage it in their own list of things to do. If there is a simple way to allow User to create their own “my work” because this is not really a matter of assignment of task. It’s a task that is derived from an update mentioned and it’s something that User needs to do and keep track of.