Heated and ventilated seats are standard. Do you have access to the configuration? Older reservations do, so they can modify their config. Newer reservations aren’t allowed to configure specifics until their order is closer to fulfillment.
you can always go to rivian.com and use the “visualize a r1s” tool to play with what the configuration can be (currently — subject to change) but you won’t be able to save it,