Cannot Add Memory Profiler Package

Hello there, I am using Unity Version 1.0.0 and is trying to install memory profiler for my project. I have followed the process shared in the documentation. But even if I click on preview packages, the package is not showing up. Is there any way we can manually add the memory profiler?

My unity version in 2020.3.40f1

Add com.unity.memoryprofiler using this
201340-obraz-2022-10-31-132432879.png