Keynote
Use phonetic guides in Keynote on iPhone
If you have a Chinese, Japanese or Korean keyboard set up for your Mac, iPhone or iPad, you can apply phonetic guides to words written in any language even if you don’t use any of these keyboards.
If you can’t see the suggestions you’re looking for, make sure the presentation is set up to use the language you want. Tap , tap Presentation Options, tap Language & Region, tap Language, then select a language.