What is the equivalent of xkill on wayland in KDE Plasma?

Xkill is a utility program distributed with the X Window System that instructs the X server to forcefully terminate its connection to a client, thus "killing" the client.[1] When run with no command line arguments, the program displays a special cursor (usually a crosshair or a skull and crossbones) and displays a message such as

Select the window whose client you wish to kill with button 1 ...

If a non-root window is then selected, the server will close its connection to the client that created that window, and the window will be destroyed.

I would like to achieve the same behavior for wayland windows, if possible.

PS: I am on Kubuntu 21.10 running a wayland session, but would prefer something DE agnostic.

KDE has a built-in function that provides this. Press CTRL+META+ESC in later versions of KDE Plasma 6+ (note that META==Win button). Then click on a window or press ESC to cancel.

If you have an old version of Plasma, use CTRL+ALT+ESC instead.