Grouped listview defining header template in the markup

[Jordan]

Is there a way to set the header template for a grouped listview in the HTML markup similar to the attempt below, which does not work for me?

<ul data-role="listview" data-style="inset" data-type="group" data-auto-bind="false" data-source="firmDataSource" data-template="firmTemplate" header-template="<h2>Letter ${value}</h2>">
</ul>

I have seen examples where the header template can be defined in javascript, but have not seen an example of doing it this way.

[Richard]

Old question but came across it while searching...
The answer is to specify the header template using the attribute "data-header-template".