select one item from listand put it in a fact

ansible_select_from_list.yml

--- 
- name: select
  gather_facts: false
  hosts: localhost
  connection: local 

  vars:
  - my_selector:
    - "the_value_to_select"   

  tasks:
    - name: use it
      debug:
        msg: "{{ first_user }}"
    - name: put it in a fact 
      set_fact:
        my_fact: "{{ the_list|  selectattr('attribute_name', 'match', lookup('vars', myvar) | first) | first }}"  
        vars:
        my_var: selector