TreeView with Kendo UI and VueJs in laravel

Dear, I can not correctly develop a treeview with Kendo UI and Vuejs in laravel. To unravel the problem, I will describe what I am using.

This is what the url of the laravel driver (index) returns, which I will then use with kendoUi to create the TreeView based on json data (it returns this data from Mysql):

The problem is that all the data is repeated in the TreeView.

But if I use the URL that KendoUI brings me, it works correctly:

callback([{"EmployeeId":2,"FullName":"Andrew Fuller","HasEmployees":true,"ReportsTo":null}])

Step to describe the code of:

KendoUI in Vuejs:

  <kendo-hierarchicaldatasource ref="remoteDataSourceComponent"
                                  :transport-read-url="'http://software.local/rubrosjson'"
                                  :transport-read-data-type="'json'"
                                  :schema-model-id="'EmployeeId'"
                                  :schema-model-has-children="'HasEmployees'">
    </kendo-hierarchicaldatasource>
    <kendo-treeview data-source-ref="remoteDataSourceComponent"
                    :data-text-field="'FullName'"
                    :checkboxes="true"
                    :drag-and-drop="true"
                    @change="onChange"
                    @check="onCheck"
                    @collapse="onCollapse"
                    @dataBound="onDataBound"
                    @drag="onDrag"
                    @dragStart="onDragStart"
                    @dragEnd="onDragEnd"
                    @drop="onDrop"
                    @expand="onExpand"
                    @navigate="onNavigate"
                    @select="onSelect">
    </kendo-treeview>

Laravel driver:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Rubros;

use Response;
use Illuminate\Support\Facades\Input;

class RubrosJson extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('auth');
    }

    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function index(Request $request)
    {
       // return Rubros::all();
        $rubros = Rubros::all();
        $resultado = Response::json($rubros)->withCallback($request->input('callback'));;


            return $resultado;










    }
}