Please download "CodeWarrior for ARMv8 Flash Programmer SDK _b200701_P2" from NXP public Website. I also attached it for you.
Please open CodeWarrior IDE and install this patch from Help->Install New Software->Add->Archive.
You will find the required folder in C:\Freescale\CW4NET_v2020.06\CW_ARMv8\ARMv8\CodeWarrior_Examples\FlashSDK.
When you install successfully, and find the AN5398 in the C:\Freescale\CW4NET_v2020.06\CW_ARMv8\ARMv8\CodeWarrior_Examples\FlashSDK\Documentation
Please kindly follow AN5398
Adding Device(s) to the CodeWarrior Flash Programmer for ARMv8 Processors