Lumina Desktop it's QT5 based, it's close to Plasma.
There's a package missing in Hyperbola GNU Linux, qt5-styleplugins. That package
makes qt5 easily themable, either with the Lumina module or with qt5ct in the outside,
allowing you to have the same theme borrowed from the GTK2/3 ones, such as Zukitre,
as we already have a matching theme for Fluxbox.
The GTK2/3 theme it's GPL, you can install it with git, meson/ninja and sassc:
git clone https://github.com/lassekongo83/zuki-themes
cd zuki-themes
meson build
doas ninja -C build install
Then by launching lxappearance and qt5ct (or the Lumina control panel for the QT5 theme),
you can set the theme to Zukitre and GTK2 for the QT5 panel one.