Custom repeater field that work with ninja forms

I need someone to build me a custom repeater field in JavaScript for my existing ninja form on my website. http://travisr7.sg-host.com/get-quote/

When the data is sent through webhook it will look like this below.

"Vehicles": [
{
"vehicle_inop": 0,
"vehicle_make": "Datsun",
"vehicle_model": "240Z",
"vehicle_model_year": 1973,
"vehicle_type": ""
},
{
"vehicle_inop": 1,
"vehicle_make": "Ford",
"vehicle_model": "Focus",
"vehicle_model_year": 2000,
"vehicle_type": ""
},
{
"vehicle_inop": 0,
"vehicle_make": "Audi",
"vehicle_model": "A4",
"vehicle_model_year": 2017,
"vehicle_type": ""
}
]