Something like ...
prev_proj_count_hours {
label "count and hours"
display_template "
@project_pipeline.cur_proj_count@
@project_pipeline.cur_proj_hours@
"
}
You'll probably want some html in the display template, and it's evil to have html in your tcl script, but the list builder doesn't really give you a way to get around that.
Hope this gives you an idea as to do what you need to do ...