How to create a new character encoding in C++?

Hello all. I have a project in which I am using Tesseract-Ocr. I have huge number of character which ASCII doesn't support. I don't know whether Unicode supports them. If yes, still, for some reasons, I will not use Unicode.

I will customize a font file, which has a custom encoding. How can I use this in C++? How can I make the font identified by C++?

I hope you guys understand my problem. I also hope that I described my problem well.
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