---
- name: Set stats test - node1
  hosts: all
  become: true
  gather_facts: false

  vars:
    bigboot_size_target: 1G
    bigboot_execute_bigboot: true
    bigboot_execute_shrink_lv: false
    bigboot_adjacent_lvm_device: /dev/mapper/system-root
    bigboot_lv_shrink_size: 2239842398

  tasks:
    - name: Set bigboot_size_target if needed
      when: inventory_hostname == 'bigboot-test-custom-7'
      ansible.builtin.set_fact:
        bigboot_size_target: 2G

    - name: Test a var
      ansible.builtin.set_stats:
        data:
          bigboot_data: "{{ bigboot_data | default({}) |
            combine({inventory_hostname:
              {
                'bigboot_execute_bigboot': bigboot_execute_bigboot,
                'bigboot_execute_shrink_lv': bigboot_execute_shrink_lv,
                'bigboot_adjacent_lvm_device': bigboot_adjacent_lvm_device,
                'bigboot_lv_shrink_size': bigboot_lv_shrink_size,
                'bigboot_size': bigboot_size_target,
                'bigboot_skip_rear_backup': bigboot_skip_rear
              }
            })}}"
      no_log: false


    - name: Debug test_set_stats
      ansible.builtin.debug:
        msg: "Locally we use bigboot_size_target -> {{ bigboot_size_target }}"

...