Spoon a few tablespoons of the matcha white chocolate mascarpone filling onto the bottom of a 2-quart baking dish. Dip around 6 ladyfingers, one by one, into the pistachio and matcha dipping liquid, arranging each ladyfinger side by side so that the filling at the bottom of the baking dish is completely covered. You might need to snap some of the ladyfingers in half to cover any gaps in the filling. Once base layer of mascarpone has been covered with the cookies, spread about 1/2 cup of the mascarpone filling over the ladyfingers. Repeat layering until the baking dish is nearly full, ending with a layer of matcha white chocolate mascarpone filling.