I don't think there is such an option (hope I'm wrong). You could do the following - convert to ePUB, rename the file with .zip and extract it. The content is all in html format. Just open a few to figure out the directory structure and delete the rest of the files in there.
But really, there are plenty of pdf to html converters out there (if I recall correctly, something like "pdf2html" should be a good start to google).
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