Nginx Reverse Proxy running as a STACK with freepbx

Im using docker and docker compose to run Portainer and on it im running a few services to make a webchat and calls, to make the calling work i need to use freepbx but when i try to deploy it out of the Portainer, he takes the machine 443 Port whole to himself so i went to set up a containarized Nginx reverse proxy to prevent that but i cant because it says i cant bind the 443 port to it, docker is already using.

I want to know how to change my Nginx/Freepbx Stack options so that they dont conflict with Docker