Take it back.
Sometimes, what we want and what is possible are two different things.
Firat, make sure your TV passes audio out and through it. This is generally done with red/white RCA jacks (which pass two-channel analog audio), and the requisite cables. Check your TV and it's manual. This is NOT a given for TV's anymore. Many don't offer it.
IF your TV DOES offer this, then look for a sound bar that will accept these analog RCA audio inputs.
If your TV doesn't, then look for a sound bar with multiple inputs, if there is such a thing. Either that, or look for a TV that DOES have those red/white analog RCA outputs.
FWIW, no TV "passes through" multi-channel audio from external sources. The best you'll get is two channels, even via Toslink, so the RCA cable objection is somewhat moot. Plus, it's only a soundbar to begin with.