Using PlaceHolder data in Qt Design Studio 4.2.0

[nguyenbinh]

Hello,

I've seen PlaceHolder feature in Qt Design Studio (Link: https://doc.qt.io/qtdesignstudio/qtquick-placeholder-data.html) and have been trying to use it but haven't succeed yet, I followed instructions:
Project files structure:

Example.qmlproject
qtquickcontrols2.conf
qml/example.qml
dummydata/dataModel.qml

File Example.qmlproject:

import QmlProject

Project {
    mainFile: "qml/example.qml"
    mainUiFile: "qml/example.qml"

    QmlFiles {
        directory: "qml"
    }

    JavaScriptFiles {
        directory: "qml"
    }

    ImageFiles {
        directory: "qml"
    }

    Files {
        filter: "*.conf"
        files: ["qtquickcontrols2.conf"]
    }

    qt6Project: true

    qdsVersion: "4.2"

    quickVersion: "6.5"

    multilanguageSupport: true
    supportedLanguages: ["en"]
    primaryLanguage: "en"
}

File qtquickcontrols2.conf:

[Controls]
Style=Basic

File qml/example.qml:

import QtQuick
import QtQuick.Controls

ListView {
    width: 600
    height: 800

    model: dataModel
    delegate: ItemDelegate {
        width: ListView.view.width
        text: name
    }
}

File dummydata/dataModel.qml:

import QtQuick 2.0

ListModel {
    ListElement {
        name: "Ariane"
    }
    ListElement {
        name: "Bella"
    }
    ListElement {
        name: "Corinna"
    }
}

What I'm expecting is the dummy data should shown up in design UI but nothing happen in 2D view of Qt Design Studio 4.2.0 (I've tried to restart Qt Design Studio several times):

Am I missing something and has anyone used this feature successfully before?