Can the API proxy be configured to proxy any request which is not handled by the dev server?

[AndyOGo]

In theory the Parcel dev server should know all resources it serves over the wire (for both http and ws).

I would like to proxy all other http and ws traffic to my local server, something in that direction.

.proxyrc:

{
  "**": {
    "target": "http://localhost:8000/",
    "ws": true
  }
}