qt qml 对象已经有一个 QQmlContext

I want get json file from local and send it to QML using this:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>

int main(int argc, char *argv[])
{
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    const QUrl url(QStringLiteral("qrc:/main.qml"));
    engine.rootContext()->setContextProperty("text_json", "{"text1": "Loading"}");
    QObject::connect(
                &engine,
                &QQmlApplicationEngine::objectCreated,
                &app,
                [url](QObject *obj, const QUrl &objUrl) {
                    if (!obj && url == objUrl)
                        QCoreApplication::exit(-1);
                },
                Qt::QueuedConnection
    );
    engine.load(url);

    return app.exec();
}

但它说 QQmlEngine::setContextForObject(): Object 已经有一个 QQmlContext 但我不了解该默认文件中的任何内容.

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow {
    id: window
    width: 640
    height: 480
    visible: true
    title: qsTr("Stack")

    property var text_json: ({"text1": "Loading"})

    header: ToolBar {
        contentHeight: toolButton.implicitHeight

        ToolButton {
            id: toolButton
            icon.source: "./images/ruby.png"

            font.pixelSize: Qt.application.font.pixelSize * 1.6
            onClicked: {
                drawer.open()
            }
        }

        Label {
            text: stackView.currentItem.title
            anchors.centerIn: parent
        }
    }
}

import QtQuick
import QtQuick.Controls