A solution to convert English numbers to Chinese numbers using ICU4J was provided here: https://stackoverflow.com/a/31532069
I would like to be able to do the same using .NET but I could not find the com.ibm.icu.text.NumberFormat class in your icu.net wrapper.
Note that NumberFormatInfo.NativeDigits is not able to convert English numbers to Chinese because it is more complex than simple digit substitution.