inTest.txt

$ ansible --version
ansible 2.9.11
  config file = None
  configured module search path = ['/home/USER/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.6/dist-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 3.6.9 (default, Jul 17 2020, 12:50:27) [GCC 8.4.0]
  
$ ansible localhost -m debug -a msg="{{ 'myapp' in sites }}" -e '{"sites":{"myapp":{"frontend": 80, "backend": 80}}}'
localhost | SUCCESS => {
    "msg": true
}