Yeah we would all love that capability, along with setting preferred justification, and top/bottom margins for paragraphs. And of course the ability to have different indentation for the opening paragraph of a scene... And heading margins/alignment. And...
It is utterly and completely unlikely to ever happen. Not even calibre which completely reconstructs a stylesheet and rewrite all the html pages tries to attempt it. First you've got the myriad of ways a style can be declared - named, non-named, inline, etc and then the complications of style inheritance.
But quite apart from all that what actually signifies a "paragraph" in the ePub? You've got so many variations of paragraphs that will be used in an ePub - blockquote vs paragraph vs div, you've got the even bigger problem of scene text, quotes, headings, opening paragraph, true body, scene breaks...
Its just a non-starter.
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