Request new function, global add font or clone existing jsPdf instance

I'm building a website use NodeJS, output PDF for customers. Currently, I call addFileToVFS() and then addFont() before every time actual draw pdf content, and this two function only cost seconds.

Is there a way to add font once and clone the jsPdf instance every time I use it, or add font to some "global object" then every new jdPdf instance can use the font? What is the best practice for NodeJS application (eg. website) for generating PDF using jsPDF with custom fonts?