Popup window for second signer same as witness

I forgot to mention. This is for FocusedView flow. First Signer should sign on Web page and enter data for Second One.

Hi Ziggy,

You can create a witness with no Name or Email and the Signer will be prompted to enter the witness information.

For example:
 

{
    "status": "sent",
    "emailSubject": "Sign Me",
    "recipients": {
        "signers": [
            {
                "email": "email@gmail.com",
                "name": "Troy W",
                "recipientId": "1",
                "clientUserId": "123",
                "routingOrder": "1",
                "tabs": {
                    "signHereTabs": [
                        {
                            "documentId": "1",
                            "pageNumber": "1",
                            "recipientId": "1",
                            "xPosition": "100",
                            "yPosition": "150"
                        }
                    ]
                }
            }
        ],
        "witnesses": [
            {
                "name": "",
                "email": "",
                "roleName": "Witness",
                "routingOrder": "1",
                "witnessFor": "1",
                "recipientId": "2",
                "tabs": {
                    "signHereTabs": [
                        {
                            "documentId": "1",
                            "pageNumber": "1",
                            "recipientId": "2",
                            "xPosition": "200",
                            "yPosition": "150"
                        }
                    ]
                }
            }
        ]
    },
    "documents": [
        {
            "documentId": "1",
            "name": "contract.pdf",
            "documentBase64": "xxxx"
        }
    ]
}

More information here: https://www.docusign.com/blog/developers/common-api-tasks-adding-witness-to-your-envelope

This is great. Is the same possible for Unknown Second Signer not Witness for FocusedView flow?