Hi I am pretty new here so maybe i am not the best source. Did you mean that you want the reader to read non-English fonts (e.g. Chinese).
For example, I would like, in the future, to use my reader to read Chinese stories etc. So I saw this thread: Seemed interesting...
https://www.mobileread.com/forums/showthread.php?t=12262
Not sure if that answers your question though