Raspberry pi bonding eth0 & wlan0 to route wg0 - help

Wireguard server is currently routing through eth0 only.

Can I create a new bonded interface like ethfi0 by fusing eth0 and wlan0, and route all wg0 traffic (wireguard interface)?

Objective is to use that to 1. Maximize thru put 2. Fail safe, if either eth0 or wlan0 goes down..

Is that possible?

Thanks