edit merchandise worth in Woocommerce order edit web page

I want to manually change product worth from the Woocommerce edit order web page.
The “pencil” subsequent to product line solely allows to edit the whole worth area, amount and Tax, not the merchandise price. I would like to vary the merchandise price for every buyer.

It’s the similar query as this thread:

https://stackoverflow.com/questions/68129776/woocommerce-how-to-change-the-item-cost-when-editing-orders

However with out resolution.

And right here there’s a clue right here:

https://stackoverflow.com/questions/50163551/change-order-item-prices-in-woocommerce-3

however I do not know the way to use it. Tried to stick it in features.php however WordPress offers an error message.

Regards