P.S. Is there any source that shows China's reserve currencies explicitly separated by their type? Because it seems like all sources including the
state administration report an aggregated value of all assets (not just dollars) converted to dollar, it even states the change in value is due to "asset price changes" and I know some sources like worldbank reporting the $3.17 trillion include China's gold reserves in it.
In short, no.
In more detail, China is a very mysterious country with a closed economy that is difficult to externally analyze. There are quite good reasons to believe that in addition to the huge official gold and foreign exchange reserve of $3+ trillion, China has a commensurate shadow gold and foreign exchange reserve, which China uses to artificially maintain an undervalued yuan and actively spends on colossal infrastructure projects, such as building millionaire cities "for growth". By some estimates, China consumes 40 times more concrete than the United States, with comparable economies.