How to return `response with download New CSV` and `plot graph` together in flask python

I m currently deploy a machine learning model in web using flask python, Does anyone know how to return my response.headers["Content-Disposition"] = "attachment; filename=result.csv" and plot graph together? Currently I only can return my plot graph but no idea how to return or get the response with new CSV file

    new_data = pd.DataFrame(dicts).set_index("Month")
    response = make_response(new_data.to_csv(index = True, encoding='utf8'))
    response.headers["Content-Disposition"] = "attachment; filename=result.csv" #Want to return this response to auto download a new CSV file also

    labels = [d['Month'] for d in dicts]
        
    values = [d['Predictions'] for d in dicts]

    colors = [ "#F7464A", "#46BFBD", "#FDB45C", "#FEDCBA",
               "#ABCDEF", "#DDDDDD", "#ABCABC", "#4169E1",
               "#C71585", "#FF4500", "#FEDCBA", "#46BFBD"]

    line_labels=labels
    line_values=values
    return render_template('graph.html', title='Time Series Sales forecasting', max=17000, 
    labels=line_labels, values=line_values)