https://stackoverflow.com/questions/75986667/jinja2-template-does-not-translate-variables

session.txt

$ tree
.
├── inventories
│   └── demo
│       ├── group_vars
│       │   └── my_group.yml
│       └── hosts.yml
├── playbook.yml
└── templates
    └── my_template.html.j2

4 directories, 4 files

$ cat inventories/demo/hosts.yml 
my_group:
  hosts:
    host1:

$ cat inventories/demo/group_vars/my_group.yml 
---
# Fake to localhost for this example
ansible_connection: local

# I don't know where those are set in your example
serverName_CN1: server1.local
serverName_CN2: server2.local

href_CN1: 'https://{{ serverName_CN1 }}'
href_CN2: 'https://{{ serverName_CN2 }}'

$ cat templates/my_template.html.j2 
      <p>
        Try:<br>
        <a href="{{ href_CN1 }}">{{ serverName_CN1 }}</a><br>
        <a href="{{ href_CN2 }}">{{ serverName_CN2 }}</a><br>
      </p>

$ cat playbook.yml 
---
- hosts: my_group
  gather_facts: false

  tasks:
    - ansible.builtin.template:
        src: my_template.html.j2
        dest: /tmp/result_{{ inventory_hostname }}.html

$ ansible-playbook -i inventories/demo/ playbook.yml 

PLAY [my_group] ************************************************************************************************************************************************************************************************************************

TASK [ansible.builtin.template] ********************************************************************************************************************************************************************************************************
changed: [host1]

PLAY RECAP *****************************************************************************************************************************************************************************************************************************
host1                      : ok=1    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   


$ cat /tmp/result_host1.html 
      <p>
        Try:<br>
        <a href="https://server1.local">server1.local</a><br>
        <a href="https://server2.local">server2.local</a><br>
      </p>