Is there a way to export a Docker container's configuration?

I have a NAS where I tested to see if some apps could run on it without a server. They overloaded the CPU, so I am now wanting to move them over to a more powerful workstation. I'm used to Compose files/configs, but it seems that my NAS uses plain Docker. Is there a way to extract the configs/long terminal setup commands? I have Portainer installed, if that makes it easier.