Variant that adapts to system dark/light settings

[flaviotordini]

Would it possible to have a variant that choose between adwait-dark and adwaita by following the system dark mode setting?

I would like to ship a .desktop file that runs my app with something like -style adwaita-auto and have the app follow the user settings.

[grulja]

It's already doing that when QGnomePlatform is used.