Allow Auto Number column to Scope at item level for Subitems

At the present, Auto Number column can Scope at Group or Board level.
I need it to Scope at Item level, as we use it to indicate the number of drafts for a given video edit.
Thank you for considering this feature request.

This feature will be useful to get numbers for all tasks, items and subitems in a board in order, from the first to the last, and not like now: one number order for items and another for subitems