How to get a specific parameter from API output?

How to get a specific parameter from API output?

Dear sir/madam, 

Hopefully you could help me with this easy code. 
I am using the following code receive data from an API: 

 info xmlResp;
 
 Drivername = xmlResp.getJSON("driverName");
info Drivername;
return "";
-----------------------------------
I want to use the driverName from the JSON data, however, I don't understand how I could get this parameter from the ouput. 

The output is: 

{"responseText":{"orderScheduled":true,"scheduleInformation":{"driverExternalId":"","driverSerial":"","driverName":"Rick","vehicleRegistration":null,"vehicleLabel":null,"stopNumber":1,"scheduledAt":"11:00","scheduledAtDt":"2022-09-27 11:00:00","arrivalTimeDt":"2022-09-27 09:05:47","travelTime":3947,"distance":81612},"success":true},"responseHeader":{"date":"Tue, 27 Sep 2022 20:01:16 GMT","access-control-allow-origin":"*","content-length":"317","server":"nginx/1.18.0 (Ubuntu)","access-control-allow-headers":"x-requested-with","content-type":"application/json","connection":"keep-alive","etag":"\"ff34865ce3c1769905711ed890dc9XXXXXXX\"","access-control-allow-methods":"POST, GET, OPTIONS"},"responseCode":200}

null

Function executed successfully


Looking forward to your reply.

Kind regards, 
Matthijs