{memory_usage} in Codeigniter 4?

I used to be able to show how much memory used by the page using {memory_usage}.
How to show it in Codeigniter 4?

The only one I know still working is {elapsed_time}. Is it the only one working now? Is there any list of variables I can use?

https://codeigniter4.github.io/CodeIgnit...hmark.html