You'll need a transmitter as no Smart TV I know does this.

There are so many transmitters that I can't pick it for you so your choice as well as finding what outputs the TV has. Some don't have audio out and many will NEVER send more than stereo. If you attempt to send HD Audio, I expect this to fail.

Frankly I would NEVER DO THIS. The chances of discovering lip sync issues is about 98%. Get a sound bar or audio system.