PrestaShop - add your own variable to whitelist

extrafieldinwhitelist.php

<?php

class ExtraFieldInWhitelist extends Module
{
    public function __construct()
    {
        $this->name = 'extrafieldinwhitelist';
        $this->tab = 'front_office_features';
        $this->version = '1';
        $this->author = 'Krystian Podemski';

        $this->bootstrap = true;
        parent::__construct();

        $this->displayName = 'Extra whitelisted field for Front-Office';
        $this->description = 'Allow to use extra fields in ProductPresenter';
    }

    public function install()
    {
        if (!parent::install() || !$this->registerHook('actionFrontControllerAfterInit')) {
            return false;
        }

        return true;
    }

    public function hookActionFrontControllerAfterInit()
    {
        $this->context->controller->get('prestashop.core.filter.front_end_object.product')->whitelist(['test_field']);
    }
}