
Samsung USB-C cable
1 m, USB 2.0, 60 W
Samsung USB-C cable
1 m, USB 2.0, 60 W
As the Galaxy S9 is equipped with a USB-C port, this cable should indeed be compatible.
I'm using this cable to power my MacBook from an adapter (not from screen), but the screen you listed above does have a USB-C Thunderbolt port with 85W power delivery. So technically, this screen should be able to charge your laptop over this cable.