Adobe Sign API - Embedded sending feature

I am working on an integration with CRM, where a PDF stored in our system can be uploaded to AdobeSign and sent out for signature. I do not see any API method or documentation explaining how to preview(iframe) the uploaded file to drag-drop the Signature box and add other fields before sending.

DocuSign provides an Embedded sending feature and works very well
https://developers.docusign.com/docs/esign-rest-api/esign101/concepts/embedding/

I have gone through several community discussions but none of them have a solution.

https://community.adobe.com/t5/adobe-sign/adobe-sign-api-edit-signature-fields-authoring/td-p/11475590

https://community.adobe.com/t5/adobe-sign/customizing-signature-fields-in-document-using-adobe-sign-api/td-p/11923819

Any help on this is highly appreciated.