How to get Dark Mode to work in Qt apps in AppImages?

[tpimh]

I am trying to package a Qt application in an AppImage. The app always has the default look regardless of the OS setting to use Dark Mode.

I tried to solve this problem by manually adding libqt5ct.so and libqt5ct-style.so to the AppImage, but this didn't change anything. My qt5ct outside of AppImage is set to use "Fusion" style with "darker" color scheme, but I still get the default look when launching the AppImage.