Hi @Araminta,
Thanks so much for your response and sorry for the delay, I totally overlooked this post.
And I had totally overlooked the modifiers options as well, and indeed, the reverse button works perfectly for light/dark variations.
That said, I think it would be even better if we could fine tune the value for each mode (light/dark), like we can fine tune each color in a palette.
I wish we could actually fine tune brightness/saturation/opacity for each modifier in both light/dark mode, see this related thread: