How to reference host variable in Ansible template?

I have the following Ansible project structure:

├── demo.yml
├── hosts
├── group_vars
│   └── all
└── roles
    ├── common
    │   ├── tasks
    │   │   └── main.yml
    │   └── templates
    │       └── init.j2

      

        
        
        
      

    

Inside the "hosts" I have:

[primary]
server1
[secondary]
server2

      

        
        
        
      

    

Casting /common/templates/init.j2 I want to be able to reference the [primary] group variable . As Ansible uses Jinja2 for its module template . I was directed to this Jinja2 doc .

I tried:

print("{{ group['primary'] }}")

      

        
        
        
      

    

But it will return:

['server1']

      

        
        
        
      

    

Right now I can only get it in a loop:

{% for host in groups['primary'] %}
    print("{{ host }}")
{% endfor %}

      

        
        
        
      

    

It will return what I want:

server1

      

        
        
        
      

    

But how do you get this result without using a loop?