When creating a subtask through an automation, I want to be able to set the due date of that subtask based on the due date of the parent task.

For example, if I have an automation that creates a new "follow up actions" subtask when a "meeting" tag is added to a task, I want the due date for the follow up actions to be 7 days after the due date of the parent task.

Currently only "on trigger date" or "days after trigger date" is possible, but I might trigger the automation months before the actual parent task is due, or on the due date itself, so it's not a reliable way of doing it.