gistfile2.txt

{{ taxonomy:years scope="item" sort="title:desc"  }}
  {{ collection:art-exhibitions taxonomy="true" as="posts"   scope="project" sort="creation_date:desc"  since="{item:title}-01-01" until="{item:title}-12-31" }}
      {{ posts scope="post }}
          <h3>{{ post:title }}</h3>
          {{ post:overview_images limit="6" }}
            {{ post:url }} {{# can not acces this variable #}}
            <a title="{{ post:title  }}" href="{{ post:url }}" class="linked-image"><img class="lazy" data-srcset="" data-src="{{ glide:value width="100" height="135" fit="resize"  }}" alt="{{ title  }}" /></a>
          {{ /post:overview_images }}
      {{ /posts }}
	{{ /collection:art-exhibitions  }}
{{ /taxonomy:years }}