jsreport doesn't provide this out of the box, but it should be easy to do with jsreport custom script beforeRender hook
https://jsreport.net/learn/scripts
You can reach there the certificate in base64 form on template.pdfSign.certificateAsset
Then you can use a custom library or open SSL command-line tool to get the desired information.
https://stackoverflow.com/a/57275782/1660996
And store this information on req.data.myCertificateInfo....
Then you can reach it through templating engines and embed the information to the final pdf.