如何在Qt 5.12中从QJSEngine获得标准输出？

QJSEngine engine;

QJSValue consoleOutput = engine.newObject();

engine.globalObject().setProperty("console", consoleOutput);

QString script = "console.log('Hello, World!');";
engine.evaluate(script);

QString output = consoleOutput.property("output").toString();

#include <QCoreApplication>
#include <QJSEngine>
#include <QDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QJSEngine engine;

    QJSValue consoleOutput = engine.newObject();
    engine.globalObject().setProperty("console", consoleOutput);

    QString script = "console.log('Hello, World!');";
    engine.evaluate(script);

    QString output = consoleOutput.property("output").toString();
    qDebug() << "Standard Output:" << output;

    return a.exec();
}