Not sure but how about something like this...
<cfoutput>
<cfset qry = QueryNew("col_a,col_b") />
<cfset QueryAddRow(qry, 2) />
<cfset QuerySetCell(qry, "col_a", "column 1 : row 1", 1)
/>
<cfset QuerySetCell(qry, "col_b", "column 2 : row 1", 1)
/>
<cfset QuerySetCell(qry, "col_a", "column 1 : row 2", 2)
/>
<cfset QuerySetCell(qry, "col_b", "column 2 : row 2", 2)
/>
<cfwddx action="CFML2WDDX" input="#qry#" output="myWddx"
/>
<form>
<textarea cols="100"
rows="20">#myWddx#</textarea>
</form>
</cfoutput>