How do I import a sun.* class in jshell

[Wang Weijun]

$ jshell -J-XaddExports:java.base/sun.security.provider=ALL-UNNAMED
|  Welcome to JShell -- Version 9-internal
|  Type /help for help

-> import sun.security.provider.SecureRandom
|  Error:
|  package sun.security.provider does not exist
|  import sun.security.provider.SecureRandom;
|         ^--------------------------------^

Thanks
Max