I'm not aware that anyone has ever created such tables of glyph info.
I suspect t-with-dot-below will be missing, along with many other non-Western-Europe glyphs.
However, it's very easy to sideload your own more extensive fonts which will appear in the Kobo's font list after a power off/on.
This will solve your problem for any book's text content but not for the book's TOC or the GUI book lists etc. Custom fonts for TOC's and GUI can be done but you would need to become comfortable with Kobo patching to do it.
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