How to use OTG (ethernet) and power on Nexus 5X using Type C connector?
From what I know, you'll want to get a usb c to usb a adapter that also has a power in port like this. Then you should be able to just plug in your ethernet adapter to the female usb a. If it's drawing too much power I've never had issues plugging usb hubs into otg cables so I can't see adding a powered usb hub into the mix being an issue.