Change Checkout Order Summary Image

[christopher_oliver]

I'm working on a module that changes the Checkout Order Summary Image to an external image url.

public function afterGetImages(ImageProvider $subject, array $result): array
 {
    foreach ($result as $itemId => $value) {
      /** @var \Magento\Quote\Model\Quote\Item $item **/
      $item = $this->itemFactory->create()->load($itemId);
        if ($item) {
          $productid = $item->getProduct();
          $result = $item['product_image']['src'] = "https://static.integromat.com/img/packages/magento_256.png";
        }

    }
    return $result;
 }

I get the error:

Notice: Indirect modification of overloaded element of Magento\Sales\Model\Order\Item\Interceptor has no effect on line 26

Which is this line:

$result = $item['product_image']['src'] = "https://static.integromat.com/img/packages/magento_256.png";

What am I doing wrong? 

How can an image on the Checkout Order Summary changed?

Thank you.