如何在复杂的数组中使用cakephp集合函数，它只适用于简单的数组

I transformed an XML to JSON, this is the link: https://api.myjson.com/bins/us5f4

I used a lot of CakePHP 3.30 and below Collection's functions. What I need to do is to only extract some data, for example the tag @INDICATOR and @TIME_PERIOD.

I already tried using nest, filter, append, map in collections and none of them work for some reason.

This is my controller:

<?php
namespace App\Controller;

use App\Controller\AppController;
use Cake\Collection\Collection;
use Cake\ORM\TableRegistry;
use Cake\Utility\Xml;

class BalancesFiscalesController extends AppController
{public function balancesDatos2(){
        $xmlArray = Xml::toArray(Xml::build('webroot/e-ggds/BalanceFiscalGC.xml'));


                    $collection = new Collection($xmlArray);
                    $collection->nest('@INDICATOR', '[]')->toList(); //I tried with the parent "Series" still same problem. It returns me the whole JSON instead of what I need. I also tried filter, map, append, no luck.

        //Gobierno Central
        $response = [
            'gob_central' =>[
                    'titulos' =>[
                        $collection
                    ]
                    ]
            ];


           $this->set([
            'data' => $response,
            '_serialize' => ['data']
              ]);

    }

}

To extract a field from a collection, you'd use the extract function. Assuming that it's all under the [data][gob_central][titulos][0][StructureSpecificData][message:DataSet][Series] key, it might look like this:

$series = $xmlArray['data']['gob_central']['titulos'][0]['StructureSpecificData']['message:DataSet']['Series'];
$data = collection($series)->extract('@INDICATOR')->toArray();

If there might be multiple items in the titulos key, then maybe more like this:

$titulos = $xmlArray['data']['gob_central']['titulos'];
$data = collection($titulos)->extract('StructureSpecificData.message:DataSet.Series.{*}.@INDICATOR')->toArray();