Allow user to add a local volume mount for all Dev Containers

I have a directory of convenience scripts, ~/scripts/, that I use in many Dev Containers. Currently, I have to individually add the mount to .devcontainer.json for each workspace. Additionally, if the .devcontainer.json in a remote repository changes, I have to reconcile my local changes to sync.

What I would like to be able to do is to add mount mappings to my User Settings, like this:

// settings.json
{
  "dev.containers.defaultMounts": [
    "source=~/scripts,target=/scripts,type=bind",
    "source=${localWorkspaceFolder}/../project_scripts,target=/project_scripts,type=bind"
  ]
}

This would be similar to how dev.containers.defaultExtensions works already.