So if you want to separate them out, put them both on there then. In fine print right above the total of them both added together. Even more price transparency
IME that is certainly the norm in many European countries. Where I'm from the labels usually say the full price and then the tax rate next to it, e.g. "120 EUR incl. 20% VAT" meaning the actual product is 100 EUR and the 20% VAT is already included in the 120 EUR price
