If it's either a selling point of the car enough that the manufacturer wants to demonstrate it accurately, or if it's something enough people care about and want to see which car suits them better, then a third party could create a simulation tool that let's you quickly go through dozens of different sun positions, weather conditions etc. and see how your personalised body shape will be positioned in each car including being able to adjust the virtual seat position, sun flaps, etc. to compare how you'll be affected by light in a different range of cars... it could be a useful feature? Hell, maybe it even extends to being able to choose the perfect custom flap size and positioning, to either get it added into a new car sale, or ordered as an after-market minor swap to improve your driving experience.
The experience of driving a real car is heavily influenced by the real world. Take those little flap things cars sometimes have to shield your eyes from the sun - the metaverse will first have to simulate an annoyance (possibly with harmful eye-melting ultraviolet light?) then let you mitigate it with the flap. It isn't obvious why people will want that or pay money for it. If they don't simulate glare, then what is the flap for?
Cars aren't independent of reality, they exist as well designed tools that allow us to do and experience things that we otherwise couldn't. When that gets translated to some sort of virtual space all the design decisions start to fall apart. The only thing that really carries over is to get the branding in front of a person to make them think of the name - which rather undermines the original "isn't going to run ads" thesis.