Help: How do I invest in Chinese Yuan?

How do I buy or invest in Chinese Yuan or companies as a US person? I have looked into it a bit, and the company I currently use, Charles Schwab, isn't able to do it. They were telling me that as a US citizen, there are a lot of geopolitical factors that would prevent me from doing so. I don't want to purchase Hong Kong Dollar, I keep being told that would be my main option if I want to invest in China. Thank you