There is a menu link in the Modern UX, on the left hand side, called "Staffing Plan". Is it possible to have this menu displayed as a module in Projects?
The "Staffing Plan" menu is built to be used standalone to get a overview of multiple projects/resources. There is no OOTB option to have it displayed as a module within projects, and to have it automatically filter for information about a project, depending on the instance being viewed.
Please also note that the End Of Life for the "Staffing Plan" menu has been announced for May 9, 2023.