Looks like it has a 3.5 on it as an AUX input, and also RCA (which can be converted from 3.5 if you prefer).
Here’s the manufacturer’s site for a pic of the inputs: https://www.vizio.com/audio/home-theater/sb2821d6.html
That said, if I were you, I’d spend the extra $100 and buy a cheap Walmart TV (doesn’t sound like you’re too picky) which will be an upgrade in both sound and picture.