I've found this video of a Chinese recipe for stuffed cabbage using red cabbage leaves. It's in Chinese but should be fairly easy to follow visually. The ingredients of the stuffing mix, in order, are glutinous rice, (cooked) pork, shiitake mushrooms, salt, white pepper, soy sauce and oyster sauce. As is usual here, no quantities are given, so you just have to use your own judgement.
And on YouTube, there is this:
Again, I think easy to follow without knowing Chinese. There are more at https://www.youtube.com/results?search_query=紫包菜