Now you can use blocks (subchapters) with markdown text (rich formatting display), with sounded words.
To add sounded word use [[sounded word or phrase]] in text. And place an audio file to content/audios/intext with the same name as text. If text and file name are different, use |: [[sounded word | name_of_file_in_intext_folder]].
All markdown headers in intext chapter should have lever more than 3 (4, 5, ... ). Because levels 2 and 3 is taken by chapters and subchapters.