Is there a way to override the theme of WidgetKit, so that we can retrieve correct named color in WidgetKit?

In main app, I can override dark/ light theme based on user preference, so that I can retrieve correct color information based on named color.

if (user preference) {
    overrideUserInterfaceStyle = .light
} else {
    overrideUserInterfaceStyle = .dark
}

// Dark theme/ light theme automatic aware color.
SwiftUI.Color("purpleColor")

However, how can I override the theme of a WidgetKit, so that my WidgetKit can interpret named color correctly?

I know in WidgetKit, I can read what is current system wide theme settings using 

@Environment(\.colorScheme)

But, that is not what I want.

I want the ability to override theme of a WidgetKit based on user preference, then able to retrieve correct named color.

Thanks.