QML ListView populate animation

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.5

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

    Timer {
        interval: 1000
        running: true
        repeat: false

        onTriggered: {
            listview.model = list
            timer2.running = true
        }
    }

    Timer {
        id: timer2
        interval: 1000
        running: false
        repeat: true

        onTriggered: list.append({"title": "add"})
    }

    ListModel {
        id: list
        ListElement { title: "test1" }
        ListElement { title: "test 2" }
        ListElement { title: "test  3" }
    }

    ListView {
        id: listview
        anchors.fill: parent

        populate: Transition {
            id: _popuTrans
            SequentialAnimation {
                PropertyAction { property: "scale"; value: 0.0 }
                PauseAnimation { duration: 500 * _popuTrans.ViewTransition.index }
                NumberAnimation { property: "scale"; from: 0.0; to: 1.0; duration: 2000; easing.type: Easing.InOutQuad }
            }
        }

        add: Transition {
            NumberAnimation { property: "scale"; from: 0; to: 1.0; duration: 4000 }
        }



        delegate: MenuItem {
            text: model.title
            width: parent.width
        }
    }
}