Currently there are 3 native Telephoto Prime lenses for Fujifilm GFX 50S II and all of these lenses are autofocus (AF) type.
GFX 50S II also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on GFX 50S II.
Since Fujifilm GFX 50S II has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 3 Telephoto Prime lenses with Weather Sealings.