How can one insert a Unicode string CSS into CleverCSS?

In particular, how could one produce the following CSS using CleverCSS:

li:after { 
   content: "\00BB \0020";
}

I've figured out CleverCSS's parsing rules, but suffice that the permutations I've thought sensible have failed, for example:

li:
   content: "\\00BB \\0020" // becomes content: 'BB 0'

EDIT: My other examples and the rest of my post weren't saved. Suffice that I had a longer list of examples that also failed, as did my closing which was something like:

I'd be grateful for any thoughts and input.

Brian