Unfortunately, most readers do not have a fully complete UTF-8 font. You can include both otf and ttf, but if you want you can convert a ttf to otf.
The SIL fonts are quite used. There is no real tool for this, but it is not hard. In short, you need to add the font to the ePUB and specify it in the stylesheet. There are some guides on the forum, if you can't find it, let us know.
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