how to show subcategories in categories?

 public function getSubCategory(Request $request)

{

    $response = array();
    try {
        $categories = Category::where(['status' => 0, 'parent_id' => 0])- >get();
        $subCategory = Category::where('status', 0)->where('parent_id', '!=', 0)->get();

        foreach ($subCategory as $sub) {

            $categoryTitle = Category::where(['id' => $sub->parent_id])- >get(['title']);


            $result[] = array(

                'cat_title' => $categoryTitle[0]->title,
                'sub_title' => $sub->title,

            );
        }
            if (count($result) > 0) {
                $response = (new ApiMessageController())->successResponse($result, "Categories List Found!");
            } else {
                $response = (new ApiMessageController())->failedresponse("No Categories List Found");
            }
    } catch (\Illuminate\Database\QueryException $ex) {
        $response = (new ApiMessageController())->queryexception($ex);
    }
    return $response;
}

I will like to display parent category and its children under it. Something:

1. Category 1
   • Sub 1
   • Sub 2
2. Category 2
   • Sub 1
   • Sub 2

i want to show data like see demo

via Chebli Mohamed