But the configuration needs to come from somewhere, like existing netlify config?

I noticed that one of the features mentioned is this --

> Netlify Dev automatically detects common tools like Gatsby, Hugo, Jekyll, React Static, Eleventy, and more, providing a zero-config setup for your local dev server.

If your framework supported by netlify, just plop the projects with no configuration.

I found one or two Python projects supported by netlify -- https://www.netlify.com/tags/python/

It looks like Netlify caters to frontend development, as far as backend, mostly static site generators supported.

I would try this out for Vue.js