After entering the URL you want to open from the home screen, you’ll be asked to search the App Store for the app artwork you wish to use as the icon. This is all done within Shortcuts and it’s a ...

However, the icon Safari currently suggests for Twitch is their old logo, which I don’t think looks as good as the new one. But I was able to fix this using Federico’s “Save App Store Icon” shortcut.

Then, click on the cloud icon and wait for the download to start ... If you subscribed to the New Scientist app via the App Store, you need to contact Apple directly to request a refund.