I looked through the code and it seems like the only ones supported are:
[ 'bold', 'italic', 'strike', 'link', 'image', 'blockquote', 'listUl', 'listOl' ]
To add buttons for heading (H1, H2, H3, etc), do I have to modify the source code? Is there any reason why UIKit is providing such a small list of options?