Gross Profit for Non-stock (service) item

I am encountering this issue in 2021 and your reply is the most detailed and meaningful.

I’ve been stuck with this issue for two days and haven’t found a solid solution. I need a way to keep track of correct gross profits for non-stock items. If you’re seeing this, can please guide me on how to determine Cost Per Item and create a custom report inside ERPNext (if that’s possible). I would be immensely grateful

I made a new detailed post on this but a yet to receive a v13 solution to this. Why hasn’t been this addressed?

My post: Buying Amount (and Gross Profit) Calculation on Service Items (non-stock) | Urgent Help Needed - #4 by simple

Thanks!