laravel-admin 中关于json组件表单的难点请教

<?php

namespace App\Admin\Forms\Navs;

use Encore\Admin\Widgets\Form;
use Illuminate\Http\Request;
use App\Admin\Models\CommonNav;

class admincp_nav_Nav extends Form
{
    public function __construct()
    {
        $this->title = trans('admin.navs.nav.table_name_Nav');
        parent::__construct();
    }

    /**
     * The form title.
     *
     * @var  string
     */
    public $title;

    /**
     * Handle the form request.
     *
     * @param  Request $request
     *
     * @return  \Illuminate\Http\RedirectResponse
     */
    public function handle(Request $request)
    {

    }

    /**
     * Build a form here.
     */
    public function form()
    {
        $this->table('common_navs',trans('admin.navs.nav.nav_list'), function ($table) {
            $table->text('displayorder', trans('admin.navs.nav.nav_displayorder'))->rules('nullable|numeric|integer|min:1');
            $menu = [
                'off' => ['value' => 0, 'text' => trans('admin.no'), 'color' => 'danger'],
                'on'  => ['value' => 1, 'text' => trans('admin.yes'), 'color' => 'success'],
            ];
            $table->switch('menu', trans('admin.navs.nav.nav_menu'))->states($menu);
            $table->text('name', trans('admin.navs.nav.nav_name'))->rules('required');
            $table->text('url', trans('admin.navs.nav.nav_url'))->rules('required');
            $target = [
                'off' => ['value' => 0, 'text' => trans('admin.no'), 'color' => 'danger'],
                'on'  => ['value' => 1, 'text' => trans('admin.yes'), 'color' => 'success'],
            ];
            $table->switch('menu', trans('admin.navs.nav.nav_target'))->states($target);
        });
        $this->disableReset();
    }

    /**
     * The data of the form.
     *
     * @return  array $data
     */
    public function data()
    {
        return [

        ];
    }
}
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