I noticed thanks to a blog post by @pbaumgartner that you can create markdown snippets and use them in .Rmd and .Rmarkdown files.
However, I often like to write my R markdown as .R files instead, put the markdown code in roxygen2-style comments, and using knitr::spin() to compile them into a document.
But in roxygen2 comments, the only code completion that works is roxygen2 code completion, like @aliases and @export. Is there a way to make my markdown snippets work in roxygen2-style comments when I'm using the knitr::spin() workflow?