Getting used to Live Text 
via tap menu in text inputs on iOS1 I'd like to use it the same ubiquitous way on macOS, but there you must use the Preview app (link via). So you have to 1st take a photo using PhotoBooth.app, navigate to ~/Pictures/Photo Booth Library/Pictures/ and open the file in Preview until you can at last select the text you want.
Is there a way to use the webcam the same way as on iOS devices, that opens a window with the live webcam image and the possibility to select text from it?
A nice way would be to make it available via Input menu in menu bar where you can also access the Character Viewer for Emojis or somehow trigger it via a script or Automator.
1) Seems to be documented nowhere
