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