(sorry no chinese system in my office computer.)
I had this experience, too and did not get the letter. There is no this kind of service in embassy. They will ask you to get this certification in China and very complicated. So I asked Isabelle Fu in Montreal to translate the chinese driving licence and the certification of driving experience. and then refer to 'Ottawa 考驾照全过程 - 08版 ' http://bbs.comefromchina.com/forum4/thread648523.html