Where you replace None with your desired action. Also I am not sure if those letters has to be capital like in the example.
Keep in mind that your desktop environment may intercept the shortcut (if you have that setting in your DE enabled) before it reaches alacritty and this config will have no effect.
Is that function of the terminal or Emacs?
If that is something only emacs can do then you have an option to run a command with alacritty key binding (rework example below).
So you want to send a key sequence to emacs and not to alacritty itself. This is pretty much specific to the termial which sequence it sends.
First check $TERM value in each terminal. echo $TERM
Alacritty do not have $TERM set by default I think so try to set it first and run emacs. TERM=alacritty emacs
If that did not work then start emacs with the value from Konsole - e.g. TERM=Konsole emacs. Does that fix the problem?
You can force alacritty to send a correct character sequence with key-binding in the config file.