Nevermind, sold all my TP-Link products, I have Asus wired mesh now.

If you haven't already, I recommend checking TP-Link's official website or contacting their customer support directly for the most up-to-date information on firmware updates and feature additions. Manufacturers often release firmware updates to address user feedback and improve product functionality, so it's possible that the Ethernet backhaul feature could be added in a future update.

Additionally, you might want to explore online forums or communities where TP-Link users discuss their experiences and share information. Sometimes, users and moderators in these communities can provide insights into potential workarounds or upcoming features.