There are no settings within the members app to showcase it in Dark mode. The only way to do it is to set dark mode phone wide, this will disable your theme, but this is the only way you'll be able to view that application within dark mode. Perhaps @SamsungModerator1 can tag this thread as feedback for future updates. Could be a feature they have in the future.
I just gave up on themes and went back to dark mode. Good locks theme park let's me do some custom changes... it's a shame you can't just use themes with dark mode though.
If you have Dark mode enabled the Members app automatically turns dark
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