title: Display a product custom field only in WooCommerce Admin single orders
body: <p>This question follows <a href="https://stackoverflow.com/questions/65874654/how-to-show-a-product-custom-field-custom-sku-in-woocommerce-orders/65875529#65875529">How to show a product custom field (custom SKU) in WooCommerce orders</a> answer to my previous question.</p>
  <p>How do I make a product custom field <code>articleid</code> (custom SKU) to be visible only in Admin Order edit pages for each order item?</p>
  <p>Also, it does not work for manual orders. How to display a product custom field <code>articleid</code> (custom SKU) <strong>on manual orders too</strong>?</p>