Sharing subtask context

We have multiple tasks like this:

Task A (Task name: Project A)

* Action 1

* Action 2

Task B (Task name: Project B)

* Action 1

* Action 2

And so on. All subtasks names are the same across the tasks as they are duplicated from a previous completed project.

Sometimes, we need to @ users that do not have the tasks shared. This leads to the pinged user having 0 knowledge of whether the subtask is for Project A or B, as the main task is not shared with them automatically.

Is there a setting where we can automatically share the main task if a subtask is shared? If not, how can we approach this problem?