Ready API Chinese Characters Testing in Request Payload

Dear Community Team members, 

We are requirement to test - 

1. Need to pass First name and Last name fields in Chinese or any other language.
2. In ready API, when are passing these values in Chinese, we are seeing under tab ???? instead of chinese characters. 
3. FYI, I am passing content-type as "application/json;charset=UTF-8" and content-language - zh-CN. 

Any recommendations please?