CreateESignatureItem(CreateESignatureItem)

{
    "id": "string",
    "allow_file_upload": false,
    "fields": {
        "property1": {
            "default_value": "string",
            "read_only": false
        },
        "property2": {
            "default_value": "string",
            "read_only": false
        }
    }
}