In Qt 5, we could specify font family fallbacks with the QML font.family property:

Text {
    text: "Hello 世界"
    font.family: "Comic Sans MS, Microsoft YaHei"
}

which is no longer valid in Qt 6. So that we need to introduce a new font.families property to expose the QFont::familes() and QFont::setFamiles() functions:

Text {
    text: "Hello 世界"
    font.families: [ "Comic Sans MS", "Microsoft YaHei" ]
}