I’m in the same situation with the Xiaomi Body Composition Scale S400 scale. Model number: MJTZC01YM. Happy to help wherever possible. I’m not well experienced in python & Bluetooth message parsing but with some guidance I could probably help.
Edit: there is also another topic about the same over here: How to add Xiaomi Mijia scale S400 (model: MJTZC01YM) into Home Assisstant