Would automatic Dark Mode be available?

**Is your feature request related to a problem? Please describe.**
Dark mode is one of many system feature that i use frequently, but copyq allows only contents to be dark via theme setting.
**Describe the solution you'd like**
Would an automatic theme change matches the system appearance be available? I remembered that such feature is available in QT 5.12.
**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.
I completely understand that cross platform compatibility is annoying but still asking with wishes.
Best