title: How to Extend and add an argument to a block with no name
body: <p>I have a block </p>
  
  <p><code>&lt;block class="Magento\Sales\Block\Adminhtml\Order\View\Items\Renderer\DefaultRenderer" as="default" template="Magento_Sales::order/view/items/renderer/default.phtml"&gt;</code></p>
  
  <p>That comes from </p>
  
  <p><code>module-sales\view\adminhtml\layout\sales_order_view.xml</code></p>
  
  <p>This block does not have a name and I can't figure out how to reference it. My objective is to display a new data-field I added to order item tables called item-comment.</p>
  
  <p>In my modules <code>\Company\ModuleName\view\adminhtml\layout\sales_order_view.xml</code> I have</p>
  
  <pre><code>    &lt;body&gt;
      &lt;referenceBlock name="order_items"&gt;
          &lt;arguments&gt;
              &lt;argument name="columns" xsi:type="array"&gt;
                  &lt;item name="item-comment" xsi:type="string" translate="true"&gt;Comment&lt;/item&gt;
              &lt;/argument&gt;
          &lt;/arguments&gt; 
  
          &lt;referenceBlock name="default"&gt;
              &lt;arguments&gt;
                  &lt;argument name="columns" xsi:type="array"&gt;
                      &lt;item name="item-comment" xsi:type="string" translate="true"&gt;col-item-comment&lt;/item&gt;
                  &lt;/argument&gt;
              &lt;/arguments&gt;
          &lt;/referenceBlock&gt;
      &lt;/referenceBlock&gt;
  &lt;/body&gt;
  </code></pre>
  
  <p>I was able to successfully extend the <code>order_items</code> block but not the renderer block</p>