SUMMARY It is currently possible to change intensity, colour and contrast of disabled widgets, but that affects their background. However, it is not possible to change text colours without affecting the background. STEPS TO REPRODUCE 1. Open System Settings, Colours, edit a set, choose "Disabled" 2. Intensity, Colour and Contrast are available for changes OBSERVED RESULT These settings affect entire widgets EXPECTED RESULT Expected a setting to only change text colour SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
This is out of scope. It can be done manually if needed