Open the Sortcuts app that comes preinstalled with your iPhone (if you can't find it, search for it on the App Store).
Now it's time to add the custom icon. First, let's find the setting for this shortcut.
We need to add the shortcut to our homescreen and set the custom icon for it. You can also change the color of the icon by tapping on the blue icon at the top (you will have to use the
You can select an image to be used as the icon. If you have the Zeus for iOS icon pack in your iCloud Drive or any other location, you can access it by tapping on "Choose File". If you want to add them to your Photo Library, then use the "Choose Photo" option (I recommend the first method to not mess with your precious Photo Gallery, but both work fine).
Tap the "Add" button at the top to finalize the process and add the icon to your Home Screen.