Hi. Are you sure it's the NanoPi 2 or any other NanoPi Neo2/S2/DUO2/... The NanoPi 2 is old and isn't sold anymore.
Best to use a usb to ethernet adapter with the NanoPi 2. I don't know of the availabillity of drivers for it.
I don't see any ethernet break-out pins on it.
Good luck.