Showing custom dialogs on Android

Hi,
I'd like to show various c++-instantiated (modal) custom dialogs in my c++/qml app.

On Windows this works well by using a "QQuickview", with Android it does not.
I do understand, that Android lacks a window manager and thus makes it impossible for QQuickView to properly work.

I've heard it might be an option to "extend QtActivity" to open dialogs - but I don't know if this is best practice and haven't found an example or how-to.

How should I deal with the need of (very small to rather complex) modal dialog elements? I have done some good research but my Google skills seem to fail me here.
Any hint to information sources is welcome! I'd prefer a multi-platform solution, but I'd also be happy with handling Android separately.

Thanks for your time and attention!
Sebastian