Nickske00
You could indeed install node/nvm/npm/yarn on the host and make it available inside the container. This can be useful for example if you wanted a build environment for a React application.
When we talk about Node.js support, we're talking about the ability to run an app persistently, to restart it automatically when the system boots or if it fails and to proxy requests from the web server to the Node application. This is what you would need to host a Node application, for example Ghost.