One way to do this would be to convert to epub, open that in Sigil, and go through inserting ChapterSplit Marks, then when you get to the end, run the 'Split on ChapterMarks', then save result. Then convert to required format.
I was going to suggest a straight convert in calibre, with output option of 'split files larger than' and use 2k-4k, but lowes amount is 100k, so that won't work.
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