_ROWNUMBER Expression Query

Hi. I am hoping someone can provide a solution for the following scenario.

I have a parent table called Tasks and a child table called Task_Details. If I create a task and add 2 task_details I see Row # 1 and 2 in the Related_Task_Details column on my Detail View. If I create another task and add 2 task_details I see Row # 3 and 4 in my Related_Task_Details column.

What I am hoping to display in my Detail View for the second task entered is the row number for each task_detail as it relates to the associated task as opposed to the row number in the Google Sheet. i.e. instead of 3 & 4 I want to display 1 & 2 again.

Is there a way that I can achieve this through an App Formula for the _ROWNUMBER column?

Hope this makes sense.

Thank you.

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