After looking at your laptop's specifications, it does have a DisplayPort over USB-C connector. It will have the DisplayPort logo next to the connector. You will need an adapter and a DisplayPort cable. I do not know if those came with your laptop. I suggest trying this out.
Your laptop's specifications:
1 x USB3.1 Gen2 Type-C with DisplayPort™ 1.2
https://www.asus.com/us/Laptops/ROG-Zephyrus-S-GX531/Tech-Specs/