I just had a look at the new LG UltraFine 4K monitor for Mac, looking at the box (image below) with the Mac logo, it seems likely that Apple were heavily involved in the design

A single USB-C cable (included) provides up to 60W of charging power to the MacBook Pro. And three downstream USB-C ports (480 Mbps) offer additional connectivity and power to compatible devices and accessories. There are no other ports.