@123 Below is the response received from the Microsoft Azure RTOS Product Team, I hope this helps in your query.
We do not have any documents on how to create new ports of Azure RTOS. As for the specific question above, we actually are scheduled to create a ThreadX SMP port for the Cortex-A35. Since the Cortex-A35 supports AArch64, we expect a fairly straightforward migration to the Cortex-A35.