How to downgrade Jinja for Ansible?
Since Ansible was installed via Homebrew on macOS, the workaround is to install Ansible using Pip.

$ brew remove ansible
$ pip3 install ansible
$  pip3 list | grep -e ansible -e Jinja2
ansible      2.8.0  
Jinja2       2.8    
$  ansible-playbook check_jinja.yaml -v
TASK [jinja_version]
ok: [localhost] =&gt; {"changed": false, "msg": "2.8"}