If you want something closer to Metro, you can use Qt Quick and https://doc.qt.io/qt-5/qtquickcontrols2-styles.html#universa.... But Qt Widgets does not ship with a Metro-like theme.
Newer Windows 10 apps have Fluent design, including acrylic effects. I don't know if Qt Quick 2 supports that, but I'm not optimistic they've updated the appearance to match.