Default target for package_source

There seem to be some default tragets that could be used when adding a cmake build step (e.g. install, install/strip, test etc.). Those are printed italic in the target list.

This also includes the "package" target, but the (also default for ninja) target "package_source" is missing.

See https://cmake.org/cmake/help/v3.22/module/CPack.html?highlight=package_source#targets-package-and-package-source

Could this be added or what could be the reason why it is not shown?