sample-process-models/misc/qa/forms/test-radio-button-1/radio-button-test-uischema.json

{
    "driving": {
        "ui:widget": "radio",
        "ui:options": {
            "inline": false
        },
        "ui:help": "Click on Yes if you are a good driver!",
         "ui:placeholder": "Test Place Holder" 
    }
}