[Custom ID field] inherit parent task ID for subtasks

Dear Asana Team,
I would like to request another feature for subtasks. It would be great if they could inherit part of the Custom ID from the parent task.

Example:

A task with two subtasks has ID AA-1.

Current Implementation: Subtasks will have AA-2, AA-3 IDs.

Wanted: Subtasks have ids AA-1-1 and AA-1-2.

This would significantly improve the organization and traceability of subtasks within a project.