@ankur,
You can use text() method of jsPDF to add extra content after chart as shown in the code snippet below.
var pdf = new jspdf.jsPDF();
pdf.addImage(dataURL, 'JPEG', 0, 0);
pdf.text(0, 230, "Simple Column Chart")
pdf.save("download.pdf");
—-
Manoj Mohan
Team CanvasJS