Я так делаю (функция afterIteration)

if ($views=$l['tvs']['options']['value']){
                    $views=json_decode($views,1);
                    $options=[];
                    foreach($views as $r){
                        $vs=json_decode($r['views'],1);
                        $o=[
                            'option'=>$r['option'],
                            'price'=>$r['price']?$r['price']:$l['sm_price'],
                            'views'=>[],
                        ];
                        foreach($vs as $v){
                            $o['views'][]=$images_base_url . $v['img'];
                        }
                        $options[]=$o;
                    }
                    $l['options']=$options;
//                    unset($l['tvs']['options']);
                }