Access the cart session - Laravel 5.8 - laravel

Question

Hi i am using sopping cart in laravel 5.8. I want to access the array to be able to store the order in the database. I was able to access the data in the session cart. But to the part of options -> marca y medida. Also I do not know how to bring the total cart.
My controller is as follows
public function transferencia(Request $request)
{
$cart = Session::get('cart');
foreach ($cart as $key => $order) {
$data = json_decode($order, true);
foreach($data as $item){
$opt = new Order;
$opt->id_cliente = $request->input('idusuario');
$opt->fecha = date('j/n/Y');
$opt->cliente = $request->input('persona');
$opt->dni = $request->input('dni');
$opt->producto = $item['name'];
$opt->medida = 'medida'; //how to access this data
$opt->marca = $item['marca']; //how to access this data
$opt->precio = $item['price'];
$opt->cantidad = $item['qty'];
$opt->total = 'total';
$opt->factura = 'factura';
$opt->idpedido = 'idpedido';
$opt->save();
}
}
//dd($item);
//print_r($cont);
}