The basic bluetooth audio profile doesn't do volume control. For such it's either tailored like Apple did or on the controls of the bluetooth devices.
My OLED C7 synced fine with my AirPods. However, I cannot our the volume up or down using the TV remote. I’m able to do that with other wireless headphones, but not the AirPods. As I said, they synced and work fine, but no volume control. Is there a fix? Or would you I assume LG Tvs are not compatible with apple airpods?