html2pdf.js: Graph not showing in pdf

hello @eKoopmans I used your library and no doubt i have to accept this is the best thing for generating pdf and resolve so many problems of mine code with just 4 5 lines. One thing is giving me a problem which i think missing on my side. When i was using just html2canvas along with jsPDF to generate there were many problems but the chart was printing now after using your library, Chart which is producing in a canvas by Chartjs library it is not printing on pdf. Any solution? this is what i am doing.

var element = document.getElementById('main_data_div'); html2pdf(element, { margin: 0, filename: 'myfile.pdf', image: { type: 'jpeg', quality: 0.98 }, html2canvas: { dpi: 192, letterRendering: true }, jsPDF: { unit: 'in', format: 'a4', orientation: 'l' } });

There is canvas element in my main_data_div