How to show PinYin (Chinese Phonetic Tone) mark?

I am hoping to create a ebook to teach chinese pronouciation through PinYin.

In Pages (IOS) it is as simple as type the "word", highlight it and and select "phonetic" and that's it. I notice that when I import document created in Pages (IOS), all the phonetic marks are gone.

I understand that some suggestion made in the internet world has been to use US Extended language and insert the indivudal phonetic.

This is ok if you are entering a few words but if i need to convert the whole pages, it will be a really really painful exercise.

Last resort will be potentially a PDF plug in?

Any help or advice or update?

Cheers,

Josh