Extend vulnerability states template for a new field in agent.labels.group

[AlexandrBubenchikov]

Background:
I found a post at https://groups.google.com/g/wazuh/c/IJMvVJh21wI
I looked at the functionality described at https://documentation.wazuh.com/current/user-manual/agents/labels.html

My current situation:
When distributing wazuh agents via an ansible role (https://github.com/wazuh/wazuh-ansible/tree/master/roles/wazuh/ansible-wazuh-agent) I give them an additional parameter label in ossec.conf. The result is

...
  <labels>
    <label key="group">Sandbox_group</label>
  </labels>
...

As a result, I can see new messages in the wazuh-alerts-* index
Sample message:

...
{
....
"agent": {
      "ip": "192.168.0.1",
      "name": "test_server",
      "id": "01",
      "labels": {
        "group": "Sandbox_group"
      }
    },
...
}
...

Question:
How can I get the agent.labels.group field to appear in the wazuh-states-vulnerabilities-* index so that I can filter and group vulnerabilities by this field?

Suggestions for improvement:
I found a similar improvement with adding a field in this issue #157.
Please improve similar functionality for labels.