It’s not direct, Lemmy doesn’t reveal these itself, but votes being federated to Mbin are exposed because that software shows them. So you’d have to use an account over there, joinmbin.org … for technical details, see github.com/LemmyNet/lemmy/issues/4967
While we are at it, if you wanted to make your votes privates, join piefed.social ;)
Not sure if this is what you’re are after, but https://github.com/lakinduakash/linux-wifi-hotspot allows, among other things, to share the Ethernet-connected PC internet (with VPN if needed) as a WLAN for TVs, Phones, etc.