This post is a demonstration of how a Voyant panel or hermeneutica can be embedded in a WordPress post. See our Voyant tutorials at dialogi.ca.
To embed the panel I created a custom HTML block. In it I pasted the <iframe> element exported from the Voyant panel I wanted. While editing I see the HTML code, when I Preview (either the block or the whole post) or publish then I see the Voyant panel in place. Try playing with it!