selfdefined/11ty/_includes/components/table-of-content-item.njk

<li>
  {{ definition.data.title | linkIfExistsInCollection(collections.definedWords) | safe  }}
  {%- if
    definition.data.flag and
    definition.data.flag.type and
    (definition.data.flag.level == 'avoid') -%}
    <span class="flag__red">{{ definition.data.flag.type }}</span>
  {% endif %}
  {%- if definition.data.sub_terms -%}
    <ul class="sub-terms">
      {% for term in definition.data.sub_terms %}
        <li class="subterm">{{ term.text }}
      {% endfor %}
    </ul>
  {% endif %}
</li>