showHome property
[final bool? showHome;[ is declaring an optional instance variable [showHome[ of type [bool[. The [?[ after the type [bool[ indicates that the variable can be [null[. This variable can be used to determine whether to show a home page or not in the [InAppWebView[ widget. However, it is not being used in the code provided and can be removed if not needed.
Implementation
final bool? showHome;