Homeassistant is such a useful project. I use it for self hosting bitwarden, ubiquiti addon and bunch of smart home devices. For SSL I have been using local root authority but is a pain to maintain. I am able to access HA client from browser and Android phones but iPhones don't want to play. How did you do LetsEncrypt with HA?
I just did Caddy container as reverse proxy for my HA server - Caddy has support for Letsencrypt built in. Needs very little configuration. This approach lets you put SSL on any webservice you are running, the configuration is not specific to HA at all.
If you use LetsEncrypt's DNS-01 challenge to setup the SSL automatically, you can even deploy valid working SSL for IPs in the private range (192.168.x.x, 10.x.x.x etc etc), allowing auto-deployment of SSL for private services on your LAN, not just publicly accessible/exposed IPs. You can get around port forwarding during initial letsencrypt setup with this too, as all happens via DNS providers public APIs.
Caddy is really easy to deploy as a Docker instance as well. There are many, many ways to accomplish LetsEncyrypt with HA though! It's really just an example of a common generic reverse proxy problem - searching for "reverse proxy letsencrypt" will show you many other ways to do it too. If you are using Docker to host your services at small scale, there are some really clever options now that auto-configure Caddy and SSL via letsencrypt all just using docker compose:
