At this point there is no such option in the HtmlExportSettings, but we think it is a nice idea. I logged your request in our backlog and you can track its implementation progress through this item in our public portal
. I also updated your Telerik point in appreciation of the suggestion.
In the meantime, maybe you could post-process the produced by the control HTML string. I'm afraid I am unable to provide other suggestions on how to achieve the desired format.