I need to create a cronjob for renewal lets encrypt certificates.
The final command should looks like this:

```
certbot certonly --no-eff-email -m my@mail.com --redirect --agree-tos --non-interactive --standalone -d mydomain.com -d www.mydomain.com -d domain1.mydomain.com -d domain1a.mydomain.com -d domain2.mydomain.com -d domain2a.mydomain.com

```

I have the following variables:

```
nginx:
  vhost:
    - name: mydomain.com
      server_name:
        - mydomain.com
        - www.mydomain.com
      ...
      ...
    - name: domain1.mydomain.com
      server_name:
        - domain1.mydomain.com
        - domain1a.mydomain.com
      ...
      ...
    - name: domain2.mydomain.com
      server_name:
        - domain2.mydomain.com
        - domain2a.mydomain.com
      ...
      ...
      ...

```

How can I get this values from `nginx.vhost.server_name` of each `vhost` in one command?