No phonetic text?

I tried to add phonetic text to a test document, but I can’t find the option. When I go to change the language for the documemt I notice that there are only a handful of european languages and no Japanese.

Desktop Libre Office which Collabora is based on allows me to add Japanese as a language when installing and use phonetic text.

Is there a way to add Japanese and phonetic text options to Collabora in Nextcloud AIO?

Experience level: Outside my comfort zone with linux CLI. First time using Docker.