Open the Shortcuts app
Tap the plus in the corner to add a new one
Tap add action and go to scripting
Tap open app and choose an app
Tap the 3 dots in the corner
Tap add to Home Screen
Give it a name, this is what will show on the Home Screen
Tap the icon next to the name and choose the icon from your photos or files
Tap add
Navigate to your home screen and see the icons
Check out my icon pack here