I'd love that, actually. The taskbar is a central piece to most desktop environments across operating systems and should be as flexible as possible.
For the time being, I can offer you a workaround this:
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Launch Zorin Appearance and select the dark theme.
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Launch "Terminal" from the application list, and run the following commands, one at the time:
gsettings set org.gnome.desktop.interface gtk-theme ZorinGrey-Light gsettings set org.gnome.desktop.interface icon-theme ZorinGrey-Light
Make sure to change that last bit to match the accent color that you want to use. For example i.e: "ZorinPurple-Light", "ZorinGreen-Light", etc.
There are a few caveats to this approach, however:
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Do not use the theme controls through Zorin Appearance, otherwise it will apply to the taskbar as well, reverting the changes you just made.
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The overall theme won't change automatically between light/dark based on the time of the day. This includes the wallpaper. But we can run yet another command at a given schedule to adjust this accordingly if you want to.
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It's possible that certain system updates reset the settings to their defaults. In that case, you'd have to go over these steps again. This is simply due because there's no built-in functionality for this at the moment, so this workaround is basically a patch.