How to send the old OpenCart 2.3 price in the order email?

Question

opencart

Hey! Tell me how I can also send the old price of the goods in the order letter, provided that there is a discount.
I wanted to do this, but I get an error. I'll post a photo below.

$order_data['products'][] = array (
          'product_id' => $product_info['product_id'],
          'name'       => $product_info['name'],
          'model'      => $product_info['model'],
          'option'     => $product_option,
          'download'   => '',
          'quantity'   => $product_quantity,
          'subtract'   => $product_info['subtract'],
          'price'      => $boc_total,
                    			'pricenew'   => $product_info['special'],
                   			'priceold'   => $product_info['price'],
          'total'      => $boc_total,
          'tax'        => $this->tax->getTax($boc_total, $product_info['tax_class_id']),
          'reward'     => $product_info['reward']
        );

Am I moving in the right direction at all? Something got confused. Thanks in advance!