Quick Access UI doesn't use rounded corners on Linux KDE

When using 1Password on Linux with KDE, the app itself looks native - it adopts the window borders and rounded corners that you would expect to see on Plasma 6.x.

However the quick access window/password prompt uses square corners.

You can force rounded corners by using KDE’s Window Rules, but unfortunately doing so will cause the window controls in the main UI to disappear:

Is it possible to implement client side decorations for the Quick Access UI as you have done with the main window?