Share Internet connection (wifi) over ethernet

Hi everyone.

I installed home assistant on a raspberry pi 4, and it’s connected to the internet via wifi (wlan0).
I’m trying to share the internet connection via the raspberry ethernet port (eth0).
Both interfaces are functional and have their own network manager profiles, but I’m not getting the internet sharing to work.

Does anyone have any tips?

p.s. This is all so that I can connect the rbpi to a powerline network and share its Internet connection, btw

Thanks