Thank you for raising the question. Not sure whether you are asking about the Grafana machine charm or the k8s charm part of COS?
I’m only able to answer for COS, where at the moment, this is unfortunately not something we have a guide for. We are currently working on adding support for ingresses (mainly using traefik-k8s) to the COS charms. As for SSL support, there are initiatives in motion for that as well, although nothing concrete yet.
For the machine charms that make up the LMA stack, maybe @mthaddon would be able to either answer or point you in the right direction?