If you are connecting the laptop to your LG TV via HDMI, make sure it uses the "display audio" or "HDMI audio" device provided by your laptop's graphics subsystem. For example if your laptop uses Intel CPUs and Intel integrated graphics, you will have to use the "Intel Display Audio" device. This will "package" and send the Zoom meeting audio to the TV's speakers or soundbar via HDMI. Here, you don't use the sound subsystem in your laptop for Zoom's audio output.
I have written a good article on my Website about this issue if you are interested in me sharing it to you.