Another answer for https://qiita.com/masa2223/items/ed9717770c81d3693c39

filter_a_list_of_dicts.yml

- name: Jinja 2 filter example
  hosts: localhost
  gather_facts: no
  vars:
    ansible_python_interpreter: /usr/bin/python3
    input_dics:
      - type: a
        name: router1
      - type: b
        name: router2
      - type: c
        name: router3
    selector: ac

  tasks:
    - name: Select dicts by selector
      debug:
        msg: >-
          {{ input_dics | selectattr("type", "in", selector)
                        | map(attribute='name') 
                        | list }}

# vim:sw=2:ts=2:et: