{% set nodes = query('netbox.netbox.nb_lookup', 'devices', api_filter='role=firewall', raw_data=true)
    | selectattr('config_context') | selectattr('config_context', 'contains', 'master')
    | selectattr('config_context.master', '==', inventory_hostname)
    | map(attribute='name') -%}

{
{% for node in nodes %}
  "{{ hostvars[node] | device_address | selectattr('family.value', '==', 4)
          | map(attribute='address') | ipaddr('address') | first }}": -1{{ '' if loop.last else ',' }}
{% endfor %}
}