There’s a lot I learned along the way, with help from Craig and others and I have since successfully published on the App Store.
I’ve distilled this knowledge into the following Gist: CMake for Qt 6 + Xcode (target iOS) · GitHub
You’ll see that, as part of this, you only need to include the asset catalog; you don’t need to (and shouldn’t) include the individual files anymore.
I hope a look at both the CMake and the Info.plist.in will answer your questions.