[Zope] dtml in structured text

Hi, In my products index_html I use structured text to show textual content like this: <dtml-var body_stx fmt=structured-text> When I enter text that should be formatted as _stx I can use structured-text and HTML or mix the two, but I can not use dtml (which would be very helpful). Is there a way to do this, or a workaround to use dtml-tags in my structured-text documents? I have plain Zope 2.6.0 (win) installed and would be very thankful for any hint ! Hans