is there like an official nintendo USB 3.0 Ethernet adapter for the switch dock? i don't wanna brick my switch using 3rd party item. nintendo switch wifi connection sucks, always keep getting disconnect while playing, doesn't have any issue on ps4 with wifi instead.
Try look for this model, officially licensed.
https://www.amazon.com/Nintendo-Internet-Officially-Licensed-wii-u/dp/B01N6S068R