I have the following at present: https://imagebin.ca/v/56B7h8nKdxjN
The idea was to mimic the style of "The Economist".
Now, their title and subtitle are aligned to the left-top. How to achieve this here?
Currently I am using this code to add title and subtitle:

// set title
    customPlot->plotLayout()->insertRow(0);
    QString title(tr("Title"));
    auto textElement= new QCPTextElement(customPlot,title);
    QFont titleFont= fnt;
    titleFont.setBold(true);
    textElement->setFont(titleFont);
    customPlot->plotLayout()->addElement(0,0,textElement);
    // set subtitle
    customPlot->plotLayout()->insertRow(1);
    QString subTitle(tr("time to complete, sec."));
    auto subtitleTextElement= new QCPTextElement(customPlot,subTitle);
    QFont subTitleFont= QFont(fnt.family(),9);
    subTitleFont.setItalic(true);
    subtitleTextElement->setFont(subTitleFont);
    customPlot->plotLayout()->addElement(1,0,subtitleTextElement);

Secondly, I would like to remove the extraneous space to the left of the y-axis.
Finally, I'd like the vertical space between the title and subtitle be smaller.

Thanks.