Seems like those are always being used anyway?
> `active-gl-driver` is a flatpak conditional that is true if the name of the active GL driver matches the extension point basename. The value can be checked with `flatpak --gl-drivers` where `host` and `default` are always inserted. The command also looks at the `FLATPAK_GL_DRIVERS` environment variable and `/sys/module/nvidia/version` for nvidia kernel module version.
https://docs.flatpak.org/en/latest/extension.html#extension-point