I know of no way to set a semantic element in the HTML format, however the conversion should maintain your formatting. Note that conversion settings will usually default to performing certain procedures such as rescaling fonts, normalizing paragraphs to indent instead of using blank paragraph separators, etc... so you may want to open the editor from the Start Menu using the standalone Edit Book launcher.
Then go to:
File ==> Import an HTML or DOCX file as a new book
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