Qt 5: read property inside Loader

How to read property timeout located inside Loader object in Qt5 QML Quick 2.0?

import QtQuick 2.0

Rectangle {
    width: 100
    height: 100
    color: "black"

    property Component comp1 : Component {
        Rectangle {
            id: abc
            property int timeout: 5000
            width: 10; height: 10;
            color: "red"
        }
    }

    Loader {
        id: loader
        sourceComponent: comp1
    }

    Component.onCompleted: console.log( "timeout: " + loader.item.abc.timeout )
}

TypeError: Cannot read property 'timeout' of undefined