No one at the big companies is developing OpenGL anymore and their support for the GLSL compiler has dwindled to nothing.

If you want that extension you're going to have better luck convincing the Zink folks:

https://docs.mesa3d.org/drivers/zink.html "The Zink driver is a Gallium driver that emits Vulkan API calls instead of targeting a specific GPU architecture. This can be used to get full desktop OpenGL support on devices that only support Vulkan."

However, you're still probably going to have to come off of GLSL and use Slang or HLSL. The features you want are simply not going to get developed in the GLSL compiler at this point.