How to mark prefill fields in Word / Docusign template to update with Power Automate

I am new to Docusign and trying to create a solution for populating data from SharePoint on a document with Power Automate before sending it to the recipients to sign.

I have created the template in MS Word and then upload it to Docusign. I have tried different things by inserting the pre-fill fields as {{Name}} or adding the input fields in the Document, but this will not show in Power Automate when I use the “Create envelope using template with recipients and tabs” action. I tried the other actions as well but same result.

I want these fields to be read-only as well when send to the recipients to sign and to put the recipients dynamically as well from the SharePoint list.

Does anyone know what I am doing wrong?

Any help will be much appreciated. Thanks!