I desperately want this, but our Frame has never been connected to the Wifi, and I'm really reluctant to do so, as it will probably start snitching and/or delivering ads...
The tv-ws-api can be used over ethernet. I control my Frame TV from a pi through direct ethernet cable and the pi separately connects to my home LAN over WiFi and serves an app for Frame art control. The TV has never had direct access to the LAN or internet. Check the frame subreddit for several such projects.
New, ad free, firmware is obv a couple of prompts away...just sayin... ;)
Adguard and Smart TV blocklist might help. It's crazy how much my Sony wants to sneak out behind my back if I'd let it.