Ansible tasks to source remote file and return resulting env vars

source_env_vars.yml

- name: Source file and return env vars
  shell: >
    . /path/to/foo.env;
    {{ ansible_python_interpreter | default('python') }} -c
    'from __future__ import print_function; import os, json; print(json.dumps(dict(os.environ)))'
  register: source_env_vars_output
  
- name: Create var from JSON
  set_fact:
    source_env_vars: '{{ source_env_vars_output.stdout | from_json }}'