Currently there are 32 native Wideangle Prime lenses for Panasonic GH5S and 16 of these lenses are autofocus (AF) type.
Panasonic GH5S doesn't have a sensor based image stabilization system and none of these lenses have optical Image Stabilization.
Since Panasonic GH5S has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 6 Wideangle Prime lenses with Weather Sealings.