Various email domain and own cert for each domain.

Hello, I have Mailcow up and running, and I need to configure more than one domain to host it on my server. I’m using my own certificate for this domain, which I place in the corresponding volume directory, and everything works fine. Now, I need to add another domain and another domain, and I will also use my own certificate for each domain. How should I do this to ensure the configuration is persistent? I’ve configured this natively in Postfix &dovecot before, but I’m not sure if adding the lines to the map_sni file will make it persistent. i will change these certs manually or with own script i’m not using letsecript by now. i eed to know to do in dovecot too.
thanks.