Lets Encrypt and transparent proxy

Hi, im running TurrisOS 5.3.10 on my Omnia with Nextcloud instance. Also I am running HomeAssistant on separate device in my LAN network. Remote access to HA is via specific port forward on Omnia. Because running and accessing these services with http only is unsecure, my question is: Its somehow possible to set up on Omnia some kind of transparent proxy with Lets Encrypt certificate, and that proxy will be localy serving / forwarding traffic to nextcloud on Omnia and HomeAssisant to the device in LAN?

Thank you!

FYI what you want here is reverse proxy, not transparent proxy.
there’s difference between those two, this should help you at least a bit in implementing.