Qt Creator cmake project add application icon to Android application

[leinad18]

I am developing an Android app using a cmake project created with Qt Creator. The application builds and runs fine on the target device (arm64-v8a). However the application uses the android standard application icon.

I tried the following:
I created a AndroidManifest.xml under Projects -> Build -> Build Android APK -> Create Templates. In the AndroidManifest.xml I chose my own icon. The AndroidManifest.xml together withg gradle files is saved in my project folder under android (e.g. android/AndroidManifest.xml). Furthermore I added it to the library in the CMakeLists.txt:

set(ANDROID_PACKAGE_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/android)
add_library(Test SHARED
      android/AndroidManifest.xml
      main.cpp
      qml.qrc
      ${TS_FILES}
)

However, the application icon does not change when the app is deployed on the phone (still uses the default android icon).

How can I use a custom application icon (e.g. a .png image) using Qt Creator and cmake?

I am using Qt 5.14.0 and Qt Creator 4.11.1.