Some ansible hash-objects samples...

ansible-hash-objects-sample

# in your group vars
HOST_SUFFIX: "dev.apps"
SERVICE_LIST:
    - {serviceName: "my_service1", destinationUrl: "http://some-random-dev-machine:5555/"}
    - {serviceName: "admin.my_service1", destinationUrl: "http://some-random-dev-machine:5556/"}
    - {serviceName: "other-service2", destinationUrl: "http://another-machine-another-port:4279/"}

# in your playbook's yaml
...
roles:
  - { role: role-consuming-a-list-of-hash-objects, tags: commons }
    
# in your role's main.yaml
- name: Generate Nginx host configuration from ansible template
  template: src=some-template.j2 dest=/etc/nginx/conf.d/{{item.serviceName}}.conf owner=root group=root mode=0644
  with_items: "{{SERVICE_LIST}}"

# in your some-template.j2
server {
  access_log /var/log/nginx/{{item.serviceName}}-access.log main;
  server_name {{item.serviceName}}.{{HOST_SUFFIX}};
  proxy_cookie_domain ~.+ {{HOST_SUFFIX}}; # when a domain is specified, reroute it to the public-facing domain

  listen 80;
  listen 443 ssl;

  ssl_certificate /somewhere/my-secret.crt;
  ssl_certificate_key /somewhere/my-secret.key;

  location / {
    proxy_pass {{item.destinationUrl}};
  }
}


# note: after running, this will produce one nginx *.conf file for each entry in the list (i.e. my_service1.conf, admin.my_service1.conf, other-service2.conf)