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In i3wm, how do I tell which screen is which workspace?

I have multiple screens and I often connect and disconnect monitors while the system is running. i3 assigns a workspace to each monitor, but does so unpredictably. Both workspaces are highlighted as active in the bottom left, but I can't tell which is active on which screen. The same goes for inactive workspaces.

Is there a way to indicate which workspace has which screen, with the native config syntax? Do I have to write my own scripts using i3-msg? Do any of i3's competitors solve this problem directly?