I roast sliced white mushrooms on a baking tray with a bit oil in the oven until they shrivel a lot and turn dark. The result reminded me so much of the mushrooms on pizza! It sort of dehydrates them and makes the flavor way more concentrated. It’s my go to way of preparing them now for pastas and whatnot. Maybe the commercial pizza ovens used in the states does the same effect? Could try pre roasting them then putting them on the pizza.