We can use the async module in Ansible to execute long running tasks. This will trigger the task to run in background.
Since this is a long running task, make sure the SSH connections stays alive and for that we can use poll interval which makes the SSH session alive.
Example playbook is given below.
- name: Simulate long running op (15 sec), wait for up to 45 sec, poll every 5 sec ansible.builtin.command: /bin/sleep 15 async: 45 poll: 5
In this same way we can run any tasks. One disadvantage of this method is that we should have an idea regarding approximate time of task completion.