This is important. Some Apps will not work!
If you uninstall WebView and later perhaps want to try e.g. the Play Store nonetheless or just add a Google account in the settings, you will just get a black screen because WebView is missing.
Without the WebView APK to install it again you can use APKMirror …
https://www.apkmirror.com/?post_type=app_release&searchtype=apk&s=com.google.android.webview
… choose the latest “Android System WebView” which is not labeled “beta”, for the correct variant choose Architecture “arm64-v8a + armeabi-v7a” and Minimum Version “Android 5.0+” (currently, as long as “Android 10.0+” doesn’t fit the Fairphone 3).