'Ansible: reduce to the variable from registers of each host

---
- hosts: all
  tasks:
  - name: Read the file
    command: cat the_file
    register: the_file

  - name: Reduce them
    set_fact:
      result: "{{ the_file.stdout }}"
      reduce: yes # magic option

When the_file in each host written as "a", "b", "c" respectively, is it possible to get the variable like ["a", "b", "c"] or "abc"?

Hosts are not connected by ssh each other, but only from the playbook running one.

ansible


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