I'm not sure if this is the method to embed a monospace font your talking about, but according to this page:
https://www.wezm.net/v2/posts/2022/m...-kobo-ereader/
it doesn't work any more. Unfortunately, the page doesn't give details on why it doesn't work and I haven't found anything else about it.
Quote:
Connect the Kobo to your computer.
Create a folder in the root of the device named fonts.
Put your chosen monospace font in the fonts folder.
Rename the fonts to follow this naming convention: Courier <Font Family>-<Font Weight>.ttf.
The leading Courier is required for the eReader to use the font for monospace text in books and not just show the font as an option in the reading settings.
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EDIT: I've not tried any of that. I just ran across the page while I was researching this and am passing it on.