Because, QTWebEngine is not available on mobile platforms, where policy dictates that all web content is displayed using the operating system’s web view, can be used instead, Qt WebView, wich provide a way to display web content in a QML application without necessarily including a full web browser stack, by using native API’s where it make sense. This implementation will alllow web browsing on Android and Quest platforms.

https://doc.qt.io/qt-5/qml-qtwebview-webview.html

https://doc.qt.io/qt-5/qtwebview-minibrowser-example.html

https://code.qt.io/cgit/qt/qtwebview.git/tree/examples/webview/minibrowser?h=5.13