ansible concatenate item / element of list of dictionaries / dict

ansible_concatenate-list-of-dict.yml

---
- name: concatenate list elements of dictionary
  hosts: all
  gather_facts: no
  vars:
    users:
      - username: alice
        email: alice@example.com
      - username: bob
        email: bob@example.com

  tasks:
    - debug:
        msg: "{{ users | map('json_query','email') | list | join('; ') }}"
      delegate_to: localhost

output.log

$ ansible-playbook playbooks/ansible_concatenate-list-of-dict.yml

PLAY [concatenate list elements of dictionary] *****************************************************************************************************************************************

TASK [debug] ***************************************************************************************************************************************************************************
ok: [your_host -> localhost] => {
    "msg": "alice@example.com; bob@example.com"
}

PLAY RECAP *****************************************************************************************************************************************************************************
your_host         : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0