I think you are confused about shaders : this is pure GPU coding, so there is no font. Indeed with shaders, everything is about drawings things with mathematics.
For example, the shader "Digital Clock" use an algorithm to draw numbers. Here is another example here with letters and numbers.
I don't know what you wanna achieve, but if you want to use a very specific font in your shader, you would have to create a bitmap image with all the characters drawn inside, so the the shader could read this texture and display each character.
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