APAC support and fonts

If I wish to import my own font, what do I need to also support APAC?

Can I import just the Latin alphabet?
What about Cyrilic and Greek?

I have seen no APAC alphabets in any of the above, so just wondering how Garmin maps that?

Its a shame the built-in fonts on fenix3 look so bad and cheap with back and foreground colors other than black and white. :(