magento2 – Add block to package field set


I am trying to add a block to the configuration screen of the products packaged in the administrator order form.

I added this design file: My / Module / view / adminhtml / design / catalog_product_view_type_bundle.xml



    
        
            
        
    

I added this block file: My / Module / Block / Adminhtml / FooBar.php

I added this template file: My / Module / view / adminhtml / templates / foobar.phtml

HELLO HELLO HELLO"; ?>

And finally I clear the cache and compile:

magento c:c
magento s:d:c

But I don't see any big HELLO on the page. What am I doing wrong?