QCustomPlot Discussion and Comments

I have multiple points scattered on the plot and I have implemented showPointToolTip method as described below:

    connect(ui->customPlot, &QCustomPlot::mouseMove, this, &MainWindow::showPointToolTip);

void MainWindow::showPointToolTip(QMouseEvent *event)
{
    //Cursor
    int x_cursor = ui->customPlot->xAxis->pixelToCoord(event->pos().x());
    int y_cursor = ui->customPlot->yAxis->pixelToCoord(event->pos().y());
    cursor_local->Detect_cursor_at_position(ui->customPlot,x_cursor,y_cursor);
}

And my Detect_cursor_at_position method is implemented as following:

void Cursor::Detect_cursor_at_position(QCustomPlot *customPlot,int cursor_x, int cursor_y){

    for (int i = 0; i < qv_x_cursor.count(); i++) {
        int cursor_coords_x = round(qv_x_cursor[i]);
        int cursor_coords_y = round(qv_y_cursor[i]);
        if (cursor_x == cursor_coords_x) {
            if (cursor_y == cursor_coords_y) {
                qDebug("Cursor detected nearby = %u \n",i);
            }
        }
    }
}

The logic of the code above is quite simple. Everytime I move the mouse on my graph, I am capturing the mouse x and mouse y position. If the mouse position matches the some point on the graph position, I want to highlight this point.

To visualize it better, see the screenshot below:
https://ibb.co/m52HN0j

When I hover my mouse over the point on the graph (yellow triangle), the logs will be printed:

                qDebug("Cursor detected nearby = %u \n",i);

My question. What method shall I use to highlight specific point on the plot when hovered over it?