Allow shell style environment variable access for paths

I made a feature request on Github addressing shell style environment tables.

Is there a way to actually do it? I feel like I am either doing it incorrectly or the feature is not supported at all.

Inside ayon+settings://applications/applications/blender/variants/3/executables/linux/0

I fill in:
/home/{$USER}/opt/blender_launcher/custom/Blender_Sandbox/blender