{% for lead in leader -%}
leader: {{ lead }}
{% if lead.follower1 is defined -%}
follower1: {{ lead.follower1 if lead.follower1 }}
{% endif -%}
{% if lead.follower2 is defined -%}
follower2: {{ lead.follower2 if lead.follower2 }}
{% endif -%}
{% endfor -%}