Incorrect resolution of the scope

In my project, I have a certain naming style guide for the products. For example, all QML engine extensions are prefixed by ext- and all dynamically loaded plugins are prefixed with plugin-.

Now, I want to simplify life for myself so that I can write something like this:

Application {
    Relies { on: 'lib-logger' }
    Relies { on: 'ext-controls' }
    Relies { on: 'plugin-mega-addon' }

    name: 'mega-app'
}

For this, I define an auxiliary item like this:

Depends {
    id: root

    property string on

    name: on
    enableFallback: false
    cpp.link: {
        var prefix = root.name.split('-')[0]

        console.warn(root.name)  // => name of the product,
                                 //    not of the Depends item
        console.warn(root.on)    // => undefined

        return prefix !== 'ext' && prefix !== 'plugin'
    }
}

I described the actual result in the comments above.

The expected behavior though would be to get the property of the item, not of the product it's in. Effectively, root.name should be equal to root.on in this case.