Calibri bold text is not render at all on Windows with FreeType

#include <QtWidgets>
#include <QtWebKitWidgets>

int main(int argc , char * argv[])
{
    QApplication a(argc, argv);

    QWebView w;
    w.setHtml("<p style='font-family:Calibri'>Some random text in Calibri<br><b>Some random bold text in Calibri</b></p><p style='font-family:Arial'>Some random text in Arial<br><b>Some random bold text in Arial</b></p>");
    w.show();

    return a.exec();
}