Display own widget in new window

[time]

Hi.
I want to do, when I click pushButton it should show new window with my widget (pie chart)

I have something like this

MainWindow::on_PieChart1_pushButton_clicked()
{
    QPieSeries *series = new QPieSeries();
    series->append("Jane", 1);
    series->append("Joe", 2);
    series->append("Andy", 3);
    series->append("Barbara", 4);
    series->append("Axel", 5);
 
    QPieSlice *slice = series->slices().at(1);
    slice->setExploded();
    slice->setLabelVisible();
    slice->setPen(QPen(Qt::darkGreen, 2));
    slice->setBrush(Qt::green);
 
    QChart *chart = new QChart();
    chart->addSeries(series);
    chart->setTitle("Simple piechart example");
    chart->legend()->hide();
 
    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
 
    //here I need to make new window and put chartView inside
}

MainWindow::on_PieChart1_pushButton_clicked()
{
    QPieSeries *series = new QPieSeries();
    series->append("Jane", 1);
    series->append("Joe", 2);
    series->append("Andy", 3);
    series->append("Barbara", 4);
    series->append("Axel", 5);
    
    QPieSlice *slice = series->slices().at(1);
    slice->setExploded();
    slice->setLabelVisible();
    slice->setPen(QPen(Qt::darkGreen, 2));
    slice->setBrush(Qt::green);
    
    QChart *chart = new QChart();
    chart->addSeries(series);
    chart->setTitle("Simple piechart example");
    chart->legend()->hide();
    
    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    //here I need to make new window and put chartView inside
}

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So how to write it, to show new window with my pie chart when I click the push button?

I know you can use setCentralWidget(QWidget *widget) but it works only with mainWindow. I need it in new window. Any ideas?