Canadian phone and i
Mine initially didn't have that option, was missing, then plugging in PD charger it suddenly shows.
I can confirm this as well. The option was completely hidden on my s23 ultra. Was charging with a generic charger compatible with super fast charging but I still wasn't seeing the option.
I then took my genuine Samsung charger and plugged the phone in it, opened game launcher from outside a game, went to settings, option was still hidden (not grayed out, completely hidden).
Then I closed the game launcher, started a game and opened it from within the game and oh miracle! The option appeared and I was able to turn it on!
Haven't tested it further as I have to run some errands but will do more tests and also update the original post once I have a few minutes.
(using Canadian version of the phone but at this point I don't think it matters. What matters is using a compatible PD charger, not just some random fast charger)