A tile for color correction

I.e. color correction can be set up with grayscale which allegedly will help reduce screentime[1]. Hence requeting a tile to turn color correction (and thus grayscale) on and off.

[1] https://www.nytimes.com/2024/01/06/technology/smartphone-addiction-flip-phone.html

As long as this isn’t there, you could use Settings - Accessibility - Text and display - Colour correction - Colour correction shortcut.