The short answer is no. Since bspwm is a non-reparenting WM, window decorations are not supported.
It looks like kwin is handling your window management anyway:
The functionality you want could be easily set up from within KDE itself, which has a native tiling feature since 5.27.
Or try your luck with a reparenting WM like i3.
Please be aware that layering different DEs and WMs is not supported. You may do as you wish with your own computer, but we shouldn’t have issues raised in the forum if things aren’t turning out how you expected.