output

$ ansible-playbook playbook.yml -i testlocal  -e remote_host=testlocal

PLAY [localhost] ***************************************************************

TASK [setup] *******************************************************************
ok: [localhost]

TASK [command] *****************************************************************
fatal: [localhost -> testlocal]: FAILED! => {"changed": false, "failed": true, "module_stderr": "/bin/sh: {{: command not found\n", "module_stdout": "", "msg": "MODULE FAILURE"}
	to retry, use: --limit @/home/will/tmp/ansible/playbook.retry

PLAY RECAP *********************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=1   

playbook.yml

- hosts: localhost
  connection: local
  
  tasks:
  - command: echo hello world
    vars:
      ansible_python_interpreter: "{{ '/usr/bin/python' }}"
    delegate_to: "{{ remote_host }}"

testlocal

testlocal ansible_connection=local