Not sure if this will work (I have not tried this, nor am I planning to try it)
But technically the Oculus Quest runs android 7.1.1 and should support NIC over USB. (support for NIC over USB was introduced in Android 6)
So in theory it could support a OTG cable with a USB NIC adapter.
I don't think anyone has tried this, and there is a very large possibility it will not work. This falls flat if the Oculus Quest devs disabled the NIC capability and/or the OTG capability in the Android kernel. (or simply removed/excluded this function from the firmware)
But imho it is the only option you could try if you want to ditch wifi.