{
  "Path" : "/opt/nfast/toolkits/pkcs11/libcknfast.so",
  "TokenLabel": "rjk",
  "Pin" : "password"
}

You can also identify the token by serial number, which in this case means the first 16 hex digits of the operator cardset's token hash:

{
  "Path" : "/opt/nfast/toolkits/pkcs11/libcknfast.so",
  "TokenSerial": "1d42780caa22efd5",
  "Pin" : "password"
}