Currently there are 15 native Macro Prime lenses for Sony A6700 and 8 of these lenses are autofocus (AF) type.
A6700 also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on A6700.
Since Sony A6700 has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 6 Macro Prime lenses with Weather Sealings.