How to change the themes for Quick Settings in KDE's System Settings?

How can I replace the two themes listed on System Settings’ Quick Settings panel?
I love it being able to switch between a light and a dark theme from here.
(Actually I would love this to happen automatically based on night color control…)

Default is Breeze and Breeze Dark. But I really love openSUSE’s desktop theme.
So I want Breeze to be replaced by openSUSE and Breeze Dark by a modified openSUSE Dark version.