Your smart TV has many useful ports, but this isn't one of them

Smart TVs are packed with more ports than you know what to do with. HDMI outnumbers them all, and that's because most of your devices use that format these days. If you don't have modern equipment, you might still get some use out of some of these older ports.

Source : https://www.pocket-lint.com/digital-audio-out-port-not-worth-it/