Craft 3 FeedMe - Help accessing deeper XML nodes
I think your problem is that &lt;listitem xml:id="A50-3487-2"&gt; has an attribute, so you would need to use &lt;p&gt;{{ node.itemizedlist.listitem['@'].para }}&lt;/p&gt; to get the node value.

See the bottom of the docs here:
https://docs.craftcms.com/feed-me/v4/feature-tour/using-in-your-templates.html