Viewoport theme for EEVEE background

I want to turn off environment lighting in EEVEE.
I can do that by setting background color to 100% black or turning strength to zero.
But both methods make the viewport background black, which is hard to work with.
I know I can turn off environment light and set viewport background to different color by
using " is Camrera ray " trick in material setting.
But I think there should be an easier way to simply set the background color to theme color.

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