[graphviz-interest] Pen width of vertical and horizontal rules in HTML-like label

Can I somehow change the pen width of vertical and horizontal rules in an HTML-like label?

Their color seems to follow the color of the table's border, but the pen width seems to be locked to 1.

It might be nice to be able to specify the color and pen width separately for each rule. Maybe attributes on the hr and vr tags could be used.

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graph {
  a [label=<
    <table border="0" columns="*" rows="*">
      <tr>
        <td>a</td>
        <td>b</td>
      </tr>
      <tr>
        <td>c</td>
        <td>d</td>
      </tr>
    </table>
  >, shape=none]
}