No, it's not supported on Linux due to this Chromium bug [1]. For example, GNOME automatically switches themes via an extension [2], and most apps like Firefox honor that setting. But not for Electron apps, at least not yet.

It would be great, since my personal preference is also light theme during the day, dark at night.

[1] https://bugs.chromium.org/p/chromium/issues/detail?id=998903

[2] https://extensions.gnome.org/extension/2236/night-theme-swit...