Appending to nested components

I'm using component.find() to search for a nested component in a big chunk of HTML content for a fieldset tag so that I can append components after it. Component.find locates the component, as seen in the console.log, but attempting to .append or use .components to inject content results in a console error: fieldSet.append is not a function. The goal is to use Traits to inject a chunk of HTML using the variable questionFieldSet into the form after the first fieldset. If I use editor.getSelected().append, the HTML injects but at the wrong position as expected. I need to inject deeply within th...