Consider this repository has a incomplete icon theme. The icons will be added gradually.
For testing you can clone the repository or download directly. Clone using your terminal.
In a Terminal run:
git clone + URL
If you want the latest release, alternatively can download from KDE Store here
Move the folder of icons to /home/.local/share/icons (in user mode) or /usr/share/icons (in root mode).
The icon theme will be in the Setiings for select