Edit basic reports

In the woocommerce reports you can see the total delivery amount of all the orders.

Its calculated based on the orders with delivery costs, all orders have or the same cost or free delivery. I want that the report show me that amount like all the orders have delivery costs, becouse i offer free delivery in some orders but i still have to pay to the delivery company.

Is there any way i can edit the amount showed on “cobrado por envío” (charged per shipment) in the report dashboard to show the amount of delivery cost * total orders?(remember i have always the same delivery cost).

Any file i can edit and upload in child theme? any idea?

Thanks.