Is it possible to keep node.js and python codes together?

It depends on how you build your dashboard. You can try using react-js and get data from running your python script on back end.

Yes, We can Integrate Python in web throw , WebAssembly is now standard language in web along with HTML/CSS/JS, Where we can integrate other language code to web browser in binary form. Refer this issue for compiling python code to WebAssembly.

I suggest you can use Docker or containerd to run different languages on one machine. The services visit each other by their names though http restful api. Use nginx for routing different url.