Cannot apply QML bindings to a QJSValue

import QtQuick 2.12
import QtQuick.Window 2.12

import MyModule 1.0

Window {
    id: window
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    MyObject {
        id: object
        jsValue: "not working" // but binding syntax works
        stringValue: "not working"
    }

    Column {
        anchors.centerIn: parent

        Text { text: "Binding QJSValue:\t" + object.jsValue }
        Text { text: "Binding QString:\t" + object.stringValue }
    }

    Binding { target: object; property: "jsValue"; value: "works" } // does not work
    Binding { target: object; property: "stringValue"; value: "works" }
}

The attachment contains a minimum reproduce example.