HDMI ports on PCs typically support audio out. However, they do not support ARC, and as far as I know, there's no way to get ARC support as it wasn't designed for PCs.
Also, as far as I know, soundbars require an HDMI output from a source to get sound. If you have a spare HDMI port on your computer you theoretically can use a soundbar.
HDMI ports on PCs typically support audio out. However, they do not support ARC, and as far as I know, there's no way to get ARC support as it wasn't designed for PCs.