...
key:employeeId=customfield_1012110062
map:firstName=customfield_10063
map:lastName=customfield_10064
map:demographicData.companyId=customfield_10065
map:lastNamedemographicData.addressLine1=customfield_10066
map:jobData.jobTitle=customfield_10067
map:jobData.supervisorId=customfield_10068
map:jobData.originalHireDate=customfield_10069
...