i am not a fonts expert but I think sigil can access any font that windows has installed in its font directory ( or the equivalent location for other O/s ) . you don't add any .ttf to the per-book epub files collection AFAIK
But once your epub arrives on your re-reader device then that device will most likely substitute its own fonts, or give up entirely if you use one it does not like
My Sony prs650 e.g. does not seem to like italic + Ariel. and chapter titles with that style come out blank on the reader though they look fine on PC.
I know that Kindle also has it's own collection of fonts so when an epub is converted to mobi & sent there, K substitutes its own fonts for those specified in CSS.
it is possible to add fonts to Sony readers but that's another topic for another forum.
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