Ejabberd with Certbot

Hi,

Can someone pls point me to any document for guide to setup Lets Encrypt SSL certificate with Ejabberd.

Searching on Google yields on the following 2 urls but none of them seem to be details the steps.
https://community.letsencrypt.org/t/securing-ejabberd/22616
https://www.ejabberd.im/forum/28648/ejabberd-letsencrypt-ssl-certificate

How to generate the full full chain pem file.

Thanks,
Sans

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