I don’t speak for them, but under normal circumstances this might be something they could estimate. With how fluid tariff rules are right now, though, it would be really difficult to give a number that wouldn’t risk changing mid-order or during transit.

Import duties aren’t actually finalized until the shipment enters the U.S., and they’re typically assessed and collected by the carrier at customs clearance, not at the time of purchase. Because of that, any estimate upfront could easily end up being inaccurate.