how to count and get values table categoryname and display google charts in Laravel 5

working with laravel 5.6 and mysql db. I have table named as vehicles in my application like this, id name categoryname 1 lki Car 2 kio Van 3 hytg Car 4 hyu Truck 5 htg Van etc

Now I am going count numbers of each categoryname as Car 2 Van 2 Truck 1

and display Google Chart using consoletvs/charts. I have one example to displaying existing all users in controller as,

class BarChartController extends Controller
{
    public function index()
    {
    $chart = Charts::database(Vehicle::all(), 'bar', 'google')
    ->elementLabel("Total")
    ->GroupByMonth();
        return view('charts.bar',compact('chart'));
    }
}

so, now I need new controller function to show above my requirement (show each categorynames in charts) how can I configure controller for it?

via Chebli Mohamed