Request for packaging loose files in Plugins

Right now I get an error when I try and add a folder under my plugin content directory to the list of “Additional non-asset directories to package”. The error tells me the folder is not within my projects Content folder.

What I want is to have json, csv, whatever I want files in a subdirectory packaged within my DLC pak file.

Given my understanding (WEAK!!) of the cooking and staging process I don’t really understand this restriction and it seems likely mainly legacy.