---
- name: get info from check_mk
  hosts: all
  vars:
    check_mk_url: "https://cmk.seboto.my-wan.de/cmk/check_mk/webapi.py"
    check_mk_body: "action=get_host&_username=automation&_secret=a688b83a-94ad-463c-8cd5-5abfeeb86349"

  tasks:
    - name: get info for host server1 from check_mk
      uri:
        url: "{{ check_mk_url }}?{{ check_mk_body }}"
        method: POST
        body_format: form-urlencoded
        body:
          hostname: "{{ ansible_hostname }}.{{ ansible_domain }}"
        return_content: True
#        validate_certs: no
#        headers:
#          Content-Type: application/json
#          Accept: application/json
      register: result

    - name: show result
      debug:
        var: result

    - name: save json data to var
      set_fact:
        json_data: "{{ result.json.result }}"

    - name: show json_data
      debug:
        var: json_data

    - name: set alias
      set_fact:
        my_alias: "{{ json_data | json_query('attributes.alias') }}"

    - name: show alias
      debug:
        var: my_alias

    - name: show ansible_hostname
      debug:
        var: ansible_hostname
...