Hmm… It is not the feature can be easily implemented. It cannot take the original CSS styles (the used in source HTML/CSS sizes/dimensions change itself depending on conversion scale factor, see https://pd4ml.com/support-topics/pd4ml-v4-programmers-manual/#customizing) and there is no possibility to export the initial original stylesheet rules/properties, aligned depending on conversion params.
It seems like the only possible way is to go through all the HTML elements and find repeating styles (after the style and scaling is applied); if there are matches, to synthesize a style sheet from them with arbitrary class names.
I’ve added the feature request for future releases. Not sure if we can address it within the next couple of months