Not directly but our switchers are extensible so this most likely could be done with a small amount of work.
You could probably create a class that inherits StandardSwitcher, then override OnSelectedWindowChanged (don't call the base method), and in your override do this to get the preview area:
Border preview = this.GetTemplateChild("PART_Preview") as Border;
Then set the preview Width/Height and background to whatever you need to show. this.SelectedWindow would return the currently selected window that should be displayed in the switcher.
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