Context Menu qml
I need some clue to implement drop down context menus like the image, I know that the menus are not implemented in qml and there is a c++ invocation inside the qml that show the menus.
You can use QtQuick.Controls, they offer a button component with an (optional) Menu, or standalone (popup) Menu QML components. You can style the menus - although it is tricky to style them dynamically (via a model offering menu text and icons), it is even possible to do so.
If it is a static menu, it should be quite easy.