It’s not exactly that, but: Open Shortcuts. Go to Automations. Create one, for App, when Safari is opened, run immediately. Create a new blank shortcut. Ad

It’s not exactly that, but: Open Shortcuts. Go to Automations. Create one, for App, when Safari is opened, run immediately. Create a new blank shortcut. Add one action: go to Home Screen. Now when you open Safari, it instantly closes again. You can disable that by turning off the automation. It’s more of a slap on the wrist than a handcuff, but a reminder that you don’t want to use the app on that device.