Binary files in jsr package

Hey I am currently trying to understand the „new“ (for me) package format (jsr.jsonjsr.json) for Deno packages and I was wandering how binary files are handled in such a package when using the package.

For example if I have a DLL file for my ffi module can I just include it in the includeinclude statement inside the jsr.iojsr.io file so that it gets cached when I use the package? Or do I need relay on a library like plug that downloads non ts/js files that I need?