Many thanks to the person who shared that you can ask your local Chinese embassy for a copy of „The Governance Of China“.
I reached out to the Chinese embassy in Vienna and got not only a super friendly response, but also an invite to the embassy + 6 copies of the German translation (2x II, III, IV)!
The death penalty would only be used in the most serious of cases. The amount you carry changes what the punishment is. A small amount is a minor crime, but if you have a large amount, more than you could use yourself, it is assumed you are distributing it. Which is much more serious. You are not going to be executed for having a few joints.