If you really want to keep them, I'd try to give them bullet points that you'd like them to touch upon or include/map it out, but make it so that they can't just copy and paste your words into a paragraph (they can tell if you wrote it)
Honestly, though, your recommenders should be happy to write the rec for you. Anything less and you may be setting yourself up to fall. Even if they agree, if they do so reluctantly, that will come across in the rec.