matrix-docker-ansible-deploy/roles/matrix-base/templates/static-files/well-known/matrix-support.j2

#jinja2: lstrip_blocks: "True"
{
    "admins": {{ matrix_homeserver_admin_contacts|to_json }}
    {% if matrix_homeserver_support_url %},
        "support_page": "{{ matrix_homeserver_support_url|to_json }}"
    {% endif %}
}