Including non-standard documents in R package

Question

I am writing a R package for my Msc's project, together with some .Rmd analysis that uses my package and generates some html reports.

I consider both the package code AND the resulting analysis as deliverables for my project, so I would like to showcase the two in a same location, maybe the same github which is already hosting my package. Question is, can I just add a /reports directory to the package structure and put my html files inside ? As package will be mostly internal use, I don't plan on submitting it to CRAN anytime soon if that matters. However, I would also like to avoid distributing my reports to other potential users.

I've just found out about the .Rbuildignore file which seems like it would do the trick, but I'd be curious to hear what's the standard practice in this case or any other suggestions you may have.

Thanks,