a.md

    $('#mandatory li').each (i, el) ->
      mandatory = $(el).text().split(':')
      if mandatory[1] is "YES"
        console.log mandatory unless $("input[name=#{mandatory[0]}]")
        $("input[name=#{mandatory[0]}]").closest('.control-group').find('label:first-child')
          .css { color : 'red' }

<ul id="mandatory">
[% FOREACH key IN metafields.keys %]
<li>[% metafields.$key.name %]:[% metafields.$key.mandatory %]</li>
[% END %]
</ul>