Not currently available. See
Import a .csv file (e.g., from OmniOutliner on iOS) and you’ll see. Sheets can be viewed on iOS and edited in the desktop DEVONthink.
The Manual might be helpful.
I’m always curious about dark mode. I have poor vision so it renders reading impossible for me and I explicitly will not buy apps that work exclusively in dark mode. But why is it important for so many folks? Or is it a millennial thing