eBay Integration - Specific Price (Discount)

When exporting products to eBay, the product_price_gross does not take the discount at all, so if there is an item on the website discounted from €100 to €79 for example, the ebay integration is still putting it as €100 and there is no way to adjust it.

The simplest would be to add a field to the current options, so the formula would look like:
[product_price_gross]-[discount]