In using the DocuSign REST API, I cannot figure out a way to make radio buttons have a caption. I am setting the “caption” and “value” attributes. The “value” attribute sets the tooltip when I hover over the button, but the button has no text. What am I doing wrong?

"radioGroupTabs": [
    {
        "documentId": 66,
        "groupName": "bill",
        "recipientId": "2",
        "tabLabel": "bill",
        "radios": [
            {
                "pageNumber": 4,
                "xPosition": 125,
                "yPosition": 524,
                "value": "Radio1",
                "caption": "Radio1"
            },
            {
                "pageNumber": 4,
                "xPosition": 126,
                "yPosition": 544,
                "value": "Radio2",
                "caption": "Radio1"
            }
        ]
    }
]```