How to add custom data files to Roblox DataModel?

I also asked this question in this StackOverflow post (where I am more likely to actually see an answer, because I am not checking this site or my related e-mail very often):

I don't seem to be able to add textual data (e.g. in CSV, JSON or XML files) to the Roblox DataModel, Workspace, ServerStorage or anywhere really?

Any hints on how to do this efficiently? Ideally, Roblox should just give me the contents of the file as a table. But if there is a way to get a raw string from a file that I have to parse manually, I could cope, too.

Unfortunately, there is no file format other than scripts for text. However, Lua has a nice way to create multiline literals:

[[Hello World!
This is a multiline string literal
Neat eh?]]

So you could just copy paste the text file directly into a Roblox script. I suggest using a Module script as you could do something like this to conveniently retrieve the string:

###Module Script:

return function() return [[

This is where 
the text would go

]] end

###Requiring Script:

-- Given the module is named ModuleScript and is parented to workspace
local text = require(game.Workspace.ModuleScript)()