[philsnow]

ssh only looks for those escape sequences on the input side / on the controlling pty.

I think you would have to do something like have the script on the remote ec2 instance emit some pattern that you configure your local terminal emulator to watch for and then somehow tell your terminal to emit the ~L sequence of keystrokes.

iterm2 can do this kind of thing, see https://iterm2.com/triggers.html .