The Array Field in blueprints.yaml

form:
  fields:
    tabs:
      type: tabs
      active: 1
      fields:
        service:
          type: tab
          title: Services
          fields:
            header.service:
              name: service
              type: list
              label: Block
              fields:
                .title:
                  type: text
                  label: Title
                  help: Title 
               .doctors:
                  type: array
                  label: Doctors
                  help: Doctors
                  placeholder_key: KEY
                  placeholder_value: VALUE
                  required: true

{% for service in page.header.service %}
{{ service.title }}
{% endfor %}

{% for meta in page.metadata %}
<meta {% if meta.name %}name="{{ meta.name }}" {% endif %} {% if meta.content %}content="{{ meta.content }}" {% endif %}/>
{% endfor %}

{% for doc in service.doctors %}
  {{ loop.index }}: {{ doc }}
{% endfor %}

<ul>
       {% for key, doctor in service.doctors %}
       <li>{{ key }} - {{ doctor }}</li>
        {% endfor %}
</ul>
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