Did your TV come with a manual? Can you access one for your particular model? That hole looks like an optical output but weird that it doesn’t have a cover. If it is a digital output you usually need to select that as the output in the TV audio menu.
New TV With an Unknown Audio Out Jack?
I have an older Zvox tv base sound bar only has coaxial RCA & Toslink optical digital inputs. I would like to use it with a new 2023 TV however the TV only has an one that I think I can use. It is the one to the left, square with a star hole. Is that a Mini-Toslink output jack?