[ansible@control plugins]$ cat mappit.yaml
---
- name: map test
  hosts: localhost
  become: no
  vars_files:
  - addresses.json
  gather_facts: no
  tasks:
  - debug:
      msg: "{{ names | map(attribute='first')}} lives in {{ names | map(attribute='address') | map(attribute='city')}}"
[ansible@control plugins]$ cat addresses.json
{"names": [ {
        "first": "anna",
        "address": {
            "city": "Breda",
            "country": "NL"
	    }
        },
	{
        "first": "denise",
        "address": {
            "city": "San Francisco",
            "country": "USA"
	    }
        },
	{
        "first": "sharon",
        "address": {
            "city": "Mombasa",
            "country": "kenya"
        } ]
}
[ansible@control plugins]$ cat addresses.yaml
names:
        - first: anna
          address:
            city: Breda
            country: NL
        - first: denise
          address:
            city: San Francisco
            country: USA
        - first: sharon
          address:
            city: Mombasa
            country: kenya