The tool itself has to be able to support the pdf/ua spec (tagged pdf). The list of possible PDF tags corresponds nicely to html tags. For example, there are <h1> through <h6> tags, table tags (<table>, <th>, <tr>, <td>), list tags (<l>, <li>), and so on.
There are minor differences, such as the tag to start a list is <l> instead of html's <ul> or <ol>. With a PDF document, the screen reader will say "list with 3 items" and then you navigate through each item. It doesn't seem to care if it's bulleted or numbered, thus the reason pdf/ua has <l> and html has <ol> and <ul>.
Anyway, the point is you don't need to use any special html tags to generate tagged pdf. The tool that generates the pdf just needs to support pdf/ua. I didn't see anything on Winnovative's website that indicated it support it.
FYI, here are the tags available in PDF/UA
<Art>
<Annot>
<BibEntry>
<BlockQuote>
<Caption>
<Code>
<Div>
<Document>
<Figure>
<Form>
<Formula>
<H>
<H1>
<H2>
<H3>
<H4>
<H5>
<H6>
<Index>
<Lbl>
<Link>
<L>
<LI>
<Lbody>
<Note>
<P>
<Part>
<Quote>
<Reference>
<Sect>
<Span>
<Table>
<TD>
<TH>
<TOC>
<TOCI>
<TR>