The majority of additional items are not available individually on an Enyaq so you have to buy one of two accessory packs.
Clever pack is £2755 or plus pack for £4830.
The only real options other than those are heat pump, sunroof or different wheels.
To get thing like electric tailgate or heated seats etc you need one of the above packs.
Even the rear wiper on the coupe is part of the packs which is crazy.