Embed the signature in the PDF using Plugin - OFSC

Hi Everyone,

I am developing the plugin to generate the PDF for the Activity task using JSPDF library .I have almost completed that. But the pain point for me here is I have to embed the technician signature and customer signature. Those are all the property in the activity.
Here is the results i am getting in the log
"activity": {
"tech_signature": "{"name":"signature.png, 11KB","file_id":163450,"entity_id":32424,"at":"3FBVSq4KazYTAjN9ugzy3RcMzDCrkqc\/Lj6V+FI\/3c="}",
"customer_signature": "{"name":"signature.png, 21KB","file_id":162748,"entity_id":32424,"at":"8va6EswDGha0IhoP9Bn2JLcdJKpBdzH09BaEiURRrE="}",
"aid": "****"
}

Here is my code