Not standard fit, and not a website option now. Tesla dealer can fit as option though. You only require it for 3 phase charging eg at work.
My build spec shows dual chargers included. Remains to be seen if they will also be enabled. Word is, dual chargers were fitted to all UK cars as required to charge at 7kW/32A from single phase. Those cars were software limited to 11kW. Remains to be seen what will arrive on mine in August.