[DefinePlugin] Be able to define globals by entry points ?

Do you want to request a feature or report a bug?
feature

If this is a feature request, what is motivation or use case for changing the behavior?
My main goal is to create a bundle per role on my app. I discovered the DefinePlugin, and looks pretty cool but it would be better if we could define globals by entry points. This way i could have multiple entry on the same file but something like :

/* webpack config */
entry: {
    "user": "path_to_client_index",
    "admin": "path_to_client_index",
}

new webpack.DefinePlugin({
    entry: {
        "user" : {
            __ROLE__: "'" + "user" + "'",
        },
        "admin" : {
            __ROLE__: "'" + "admin" + "'",
        },
    }
})

/* entry index.js */
import route from "routes/" + __ROLE__;