Can I submit a Jotform sign using API?

I have field in my sign document form that needs to be pre-populated.
Here's the step I'm looking into:
1. Submit a Jotform Form using API.
Fileds are Email of signer1 and signer2.

2. Using workflow assign Jotform sign to Signer1 (ME) and Signer2 (Client)

3. Using different tool. Send API to submit jotform sign assign to me
only need to fill name, position fields.
4. Once submitted, it will be assigned to Signer2

Hi Santosh,

Thanks for reaching out to Jotform Support. Check out this link about API methods, to see how to submit form entries through Jotform API. Unfortunately, we can't send a signed document through API, and the prefill feature isn't available for a sign document right now. While the feature you’re looking for isn’t currently available, rest assured we’re always working to add new services and features to Jotform. 

I've gone ahead and escalated your request to our Developers. When or if it's implemented depends on their workload, how viable it is, and how many other users request it. If there are any updates, we’ll circle back to this thread and let you know. 

In the meantime, let us know if you have any more questions.