Some Qt APIs suffer from weakly typed durations, and it can be hard to see the unit of durations from code.

This could be improved by supporting properties with std::chrono durations, such as std::chrono::milliseconds, as QML properties.

See https://codereview.qt-project.org/c/qt/qtmultimedia/+/632065/ for an example where a networkTimeoutMs property would be better expressed with std::chrono::milliseconds than with ints.