When building aab file for few abi (using QT_ANDROID_ABIS variable) following warning is produced:

Qt/6.3.1/android_armv7/lib/cmake/Qt6/qt.toolchain.cmake:82 (message):
 The toolchain file to be chainloaded
 '/opt/android/android-ndk-r22b/build/cmake/android.toolchain.cmake' does
 not exist.

The reason of warning is that I have NDK installed at different location and android.toolchain.cmake script expect to read it from variable ANDROID_NDK_ROOT while in Qt Creator there is only variable ANDROID_NDK.

Adding ANDROID_NDK_ROOT manually clears the warning.