Web Service Connector Tool - complex \ nested objects

Hello,

I am following this guide to create a new REST connector for my MIM 2016: https://docs.microsoft.com/en-us/microsoft-identity-manager/reference/microsoft-identity-manager-2016-ma-ws-restgeneric#next-steps

this is my sample response:

{"EmployeeList": [
		{"Id": <TZ-id-number>,"EmployeeId": <worker-id>,"Name": {"first": <first-name>, "sir": <sir-name>},"Contract":{"code": <code number>,"desc": <description>},"Classification": {"code": <code number>,"desc": <description>},"Status": {"code": <code number>,"desc": <description>},"Company": {"code": <code number>,"desc": <description>},"Job": {"code": <code number>,"desc": <description>},"Position": {"code": <code number>,"desc": <description>},"Department": {"code": <code number>,"desc": <description>},"SecondaryDepartments": [
									{"code": <code number>,"desc": <description>},
									{"code": <code number>,"desc": <description>},
									{"code": <code number>,"desc": <description>}
								],"Office": <office phone>,"Mobile": <mobile phone number>,"Home": <home phone number>,"HireDate": <date>,"RetireDate": <date>,"UpdateDate": <timestamp>
		}
	]
}

the guide doesn't specify how to select advanced objects - and I am unsuccessful in figuring it out by myself. 
for example how would I configure first name in the web service configuration tool?