I don't know of one. If there is I'd be interested too. Especially if it had a feature to force you repeat X cards for every Y pages read.
For "kanji flashcards" I use my random screensaver mod, it displays a random character whenever the device goes into standby. Doesn't do much for learning that way, though, it's just a gimmick...
It might be hard to add such a thing to the official Kobo reading software. If you were to use an OSS alternative such as KOReader, maybe it could be done with some scripting...
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