In many applications, Java is used to allow data entry to create
report documents containing paragraphs, equations, lists, tables,
plots, or charts. While JavaFX may contain the UI elements to do this,
can you add a feature to save a combination of these elements into
a single document?

And then allow that document to be read into the JavaFX UI, edited by
the user, and saved again. The document format should not be html,
but some form of xml, maybe FXML, based on an xml schema.