HomePod as an extra speaker for Samsung tv and more?

you can only do this if the tv in question support airplay

go here Apple TV app - Devices - Apple

and scroll down to

"AirPlay 2–Enabled TVs and Devices"

to see if your tv support it

How do we do this

You can only connect to HomePods over Wi-Fi using Apple's AirPlay 2 protocol. You cannot connect over BlueTooth.

tt2