How to get the symbolgraph for the standard library modules from PackagePlugin

the PackagePlugin module allows you to generate the symbolgraph for any module or dependency in a project through PackageManager.getSymbolGraph(for:options:), as long as the module originates from a package. is there a way to do the same for standard library modules (e.g. Swift, _Concurrency, etc.) and core modules (e.g. Foundation)? i’m running into great difficulty distributing these symbolgraphs as pre-generated data, and reconciling that with the dynamically-generated SPM symbolgraphs.