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Yes that is possible, you can check our signature widgets here: http://widgets.jotform.com/search/signature.
If you are looking for echosign, we have a new addition in our widgets, it's the Adobe DC eSign Services (formerly known as echosign). I believe that's what you are looking for.
I also noticed that you are on guest account, I would suggest that you register or sign up an account to us for you to fully utilized our features.
Do let us know if you need more assistance on this.