How to use externally compiled binary to create openwrt package with menu

I am trying to create my first openwrt package. I have a Golang captive portal software that I use and would like to compile it into openwrt. I think this part is pretty straightforward and simple for me. How do I get that binary into a fully functioning openwrt program with possibly a menu for configurations? I have tried to follow helloworld but it seems to do everything from source viewpoint.