nginx revproxy with docker

Hi! I want a nginx reverse proxy configuration deployed using docker. I will portforward in the router to the container. I am using dynamic dns lets call it something.x.z. reverse proxy requirements: external subdomain requests proxyed to internal ips like jira.something.x.y would proxy to my local jira website the subdomain requests i want to proxy for local too. if i go to jira.something.x.y either from internet or local i want to proxy to same thing budget 20$