Install Ansible.

# pkg ins py36-ansible
# mkdir /usr/local/etc/ansible
# cp /usr/local/share/examples/py36-ansible/hosts /usr/local/etc/ansible
# cp /usr/local/share/examples/py36-ansible/ansible.cfg /usr/local/etc/ansible

Configure Ansible.

# vi /usr/local/etc/ansible/hosts

[all:vars]
ansible_python_interpreter=/usr/local/bin/python3.6

[freebsd]
fhost1.lan ansible_ssh_host=192.168.191

Configure SSH access and install Python36 on host.

Test connection.

# ansible-3.6 -m ping fhost1.lan