Ethernet adapter for iPado iOS14

Apple does not produce an Apple branded Lightning to Ethernet adapter - but Belkin does manufacture an adapter of this type. As for guarantee of compatibility with your iPad and iPadOS14, only Belkin would be able to provide definitive comment.

Belkin Ethernet + Power Adapter with Lightning Connector

https://store.apple.com/uk/xc/product/HMJU2ZM/A

The Auxiliary Lightning connector on the Ethernet Adapter is for connection of your Power Adapter only. It does not provide a full passthrough Lightning interface.