How can I enable dark mode for the Windows Forms Designer in JetBrains Rider?

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I am developing a Windows Forms application in JetBrains Rider and using the WinForms Designer to design my forms.

My IDE theme is set to a dark theme (high contrast / dark mode), but the Windows Forms Designer area remains white. I would like the designer background to be dark as well so it is easier to work at night.

I have already enabled the Windows Forms Designer in the Rider settings, but I cannot find any option to change the designer background color or enable a dark theme.

Is it possible to make the WinForms Designer dark in Rider, or is this currently not supported?