Note that the original Pladium (2021+) Model S and X were supposed to have RGB ambient lighting, very similar to the Highland Model 3. This was supposed to appear in the silver trim on the dash and doors. The first hundred or so Model S had the LEDs and wiring, but after that batch, Tesla removed the LEDs and left the wiring. The silver trim was changed from translucent to opaque at that time too and the light-pipes were removed from behind the trim.
As far as I know, software was never available in the S to activate the LEDs for those few cars that had it. Tesla never stated what went wrong. It might have been a supply issue, or the brightness was not sufficient (they used light pipes, which can be quite dim if not designed perfectly). Anyway, strong rumors say ambient lighting will be in the new Model S shipping out shortly (maybe this month). If it uses the existing leftover wiring, It would seem fairly easy for Tesla to offer an upgrade kit, but I'd expect it to be $500 or more. I guess that the installation time would be about an hour.