Kobo shoud support the Chartwell font.
Quote:
This set of tools for easily creating graphs is conveniently disguised as a set of fonts. OpenType features are used to interpret and visualize the data. The data remains as editable text, allowing for painless updates.
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See here
Kobo or Access as a member of the
Readium Foundation should suggest this a wanted feature of HTML5/EPUB3 Reader. To be sure that it is fully supported.