Had a look in the service manual but can't find any mention of them and they don't even exist in any of the images in there... but as others have said, torque specs for these particular nuts really aren't important. That's coming from someone who is normally very concerned with using the correct torque specs for everything as well
EDIT: Just realised why I can't find them in the service manual... because they didn't exist when I got my supra and downloaded the service manual lol they were only on the Z4 at that time. Guess they added them to newer supras as well since then