How to use template variables (tabs) inside a document created outside DocuSign (Google Docs)

Hi, I am generating a document in Google Docs where I add variables like {{NAME}}, {{EMAIL}}, etc. Then I export that file (PDF) and send it using the DocuSign API.

The envelope sends successfully, but the variables are not getting replaced by the values I pass in the API. The final document still shows {{NAME}} instead of the actual name.

I am confused:

1. Is Google Docs the correct place to create documents with variables for DocuSign?

2. Does DocuSign support the {{NAME}} syntax, or does it require special tags?

3. What is the correct way to insert fields (merge fields / tabs) so that the values I send in the API appear inside the document?

Below is what I want:

• Create document with placeholders

• Send envelope through API

• Fill placeholders with values programmatically