Provide additional path mappings, beside root in the attach configuration

Is your feature request related to a problem? Please describe.

This is my launch config to attach a remote debugger to an application deployed in Cloud Foundry:

    {
      "name": "Attach to a Cloud Foundry Instance on Port 9229",
      "port": 9229,
      "request": "attach",
      "type": "node",
      "localRoot": "${workspaceFolder}",
      "remoteRoot": "/home/vcap/app"
    },

Cloud Foundry's NodeJS buildpack will install dependencies in /home/vcap/deps/0/node_modules.
I cannot hit breakpoints that I set in my local node_modules directory tree as the launch config is set to map the root to /home/vcap/app.

Describe the feature you'd like
I would like to have the possibility to map specific paths other than root.

At the moment my suboptimal workaround is Node.js debugging via Chrome, where I am able tot navigate the remote structure and set breakpoints in /home/vcap/deps/0/node_modules.