TypeScript: Converting an Existing Ember App mentions old tsconfig/ember package

https://guides.emberjs.com/release/typescript/application-development/converting-an-app/

It mentions you should install `@tsconfig/ember` and look at the tsconfig from the blueprint output, but there it uses the new `@ember/app-tsconfig`.

If there not an easier way to convert an app? Like run some cli / cli-update command that initializes a new ember app with `--typescript` and it adds the diff to your app?