OS_ENV: "test"
IS_TEST: '{{ "OS_ENV" == "test"}}'
#IS_TEST: '{{ "OS_ENV" == "test"}}'
#IS_TEST: '{{ "OS_ENV" == "test" | bool}}'
#IS_TEST: "{{ OS_ENV == 'test' | bool }}"
#IS_TEST: ("{{OS_ENV}}" == 'test')
#IS_TEST: true
test_boolean: "{{'TEST_IS_TRUE' if IS_TEST else 'TEST_IS_FALSE'}}"

- name: "test_boolean is {{ test_boolean }} when IS_TEST is {{ IS_TEST }}"
  debug:
    msg: "Message is:  test_boolean is {{ test_boolean }} when IS_TEST is {{ IS_TEST }}"

"msg": "Message is:  test_boolean is TEST_IS_FALSE when IS_TEST is False"