Here’s the official Qt link about deploying to android devices or emulators: Connecting Android Devices
You should see the available Android emulators in the Qt Creator options/preferences in the Android section.
Just create, configure and start the emulators there. You can also use the Android Studio AVD Manager if you prefer that.
You then should be able to select the emulator when running an Android build. It appears in the list of available devices just like a real connected Android device.