At the moment, I'm afraid you can't.
It is currently in beta for S25 series only.
It is currently in stable for Fold 7 and Flip 7.
As
@arianwen27 has advice, it isn't ready for a wide release yet.
Separately, it is worth noting that visually there is very little change between 7 and 8.
I am not employed by Samsung nor do I receive any remuneration as a Samsung Members Star.
My device is an S25 Ultra.
