Making a nested menu array

I am making a nested menu array from the response that I get from WP database. I am getting the data from WP in the controller in Laravel with the help of corcel package, and then making an array with menu data, which is now one level deep. So, when a menu link has a submenu links, the array looks like this:

{
    "Hjem": {
        "ID": 112,
        "title": "Hjem",
        "slug": "hjem",
        "url": "http://hivnorge.app/?p=112",
        "status": "publish",
        "main_category": "Hovedmeny",
        "submenus": [
            {
                "ID": 129,
                "title": "Lorem ipsum",
                "slug": "lorem-ipsum",
                "url": "http://hivnorge.app/?p=129",
                "status": "publish",
                "main_category": "Nyheter"
            }
        ]
    },
    "Nytt test innlegg": {
        "ID": 127,
        "title": "Nytt test innlegg",
        "slug": "nytt-test-innlegg",
        "url": "http://hivnorge.app/?p=127",
        "status": "private",
        "main_category": "Nyheter",
        "submenus": [
            {
                "ID": 125,
                "title": "Test innlegg",
                "slug": "test-innlegg",
                "url": "http://hivnorge.app/?p=125",
                "status": "publish",
                "main_category": "Nyheter"
            },
            {
                "ID": 129,
                "title": "Lorem ipsum",
                "slug": "lorem-ipsum",
                "url": "http://hivnorge.app/?p=129",
                "status": "publish",
                "main_category": "Nyheter"
            }
        ]
    },
    "Prosjektsamarbeidets verdi": {
        "ID": 106,
        "title": "Prosjektsamarbeidets verdi",
        "slug": "prosjektsamarbeidets-verdi",
        "url": "http://hivnorge.no.wordpress.seven.fredrikst/?p=106",
        "status": "publish",
        "main_category": "Prevensjon"
    }
}

This is how I am creating this response:

        $menu = Menu::slug('hovedmeny')->first();
        $res = [];

        foreach ($menu->nav_items as $item) {
            $item->makeHidden($hiddenAttributes)->toArray();
            $parent_id = $item->meta->_menu_item_menu_item_parent;

            if ($parent_id == '0') {
              if ($item->title == '') {
                  $item = $this->findPost($item);
              }
              $parentItem = $item;
              $res[$parentItem->title] = $parentItem->makeHidden($hiddenAttributes)->toArray();
            }
            else {
              $childItem = $this->findPost($item);
              $res[$parentItem->title]['submenus'][] = $childItem->makeHidden($hiddenAttributes)->toArray();
            }
        }

        return $res;

How can I make this flexible and enable deeper nesting, so that I can have submenus inside submenus?