Convert PWA to android/IOS app

I’ve developed a PWA app and wish to convert it to an Ionic 4 Android/IOS app. I used this service https://appmaker.xyz/pwa-to-apk/ which worked fine, created the APK and uploaded to the google store, but when I downloaded & installed it, it turned out to be just the PWA with the address bar on it.
Any idea how to create a regular APK/AAB from a PWA?

Thanks.