UI Image Cutout / Masking in spefic areas with sprites

Hi everyone ;) It is my goal to create a tutorial to explain an app. While explaining the functions, I want to set a focus on these by greying out everything else.

In my opinion I have three options: 1. Create a "full-screen-sprite" with the specific cutouts. 2. Create multiple images to leave out the specific part 3. Create a black background in black with alpha and cutout peaces to set the focus.

I prefer option three and wanted to ask if someone was able to reach something like that or even knows a better solution.

Thanks and kind regards, Jannis