How to use a dynamic value in and API call with invoke url

I am working on a form that will autofill multiple fields based off of a parameter (Case_Number) value that is passed through url. I want to append that value to the endpoint in my API as query so I can grab the corresponding data to that Case_Number to autofill other fields in my form. I was thinking something similar to a JavaScript template literal, but I can't seem to find a way to do this with Deluge. Any suggestions?

// On load of form, Case_Number will be the unique ID that triggers the autofill of several other fields
//casenumber = input.Case_Number;
response = invokeurl
[
url :"https://data.wcad.org/resource/rzdy-vxin.json?casenumber=" + input.Case_Number
type :GET
connection:"arb_minutes_to_tyler_api"
];
//
quickRefID = response.getJSON("quickrefid");
taxYear = response.getJSON("taxyear");
appellantName = response.getJSON("appellantname");
appealID = response.getJSON("appealid");
noticeValue = response.getJSON("fnoticevalue");
owner = response.getJSON("ownerpartyname");
propertyType = response.getJSON("propertytypecode");
legalDescription = response.getJSON("legaldescription");
appellantAddress1 = response.getJSON("appellantaddress1");
appellantAddress2 = response.getJSON("appellantaddress2");
appellantCity = response.getJSON("appellantcity");
appellantState = response.getJSON("appellantstate");
appellantZip = response.getJSON("appellantzip");
typeOfProtest = response.getJSON("appealreasonscode");
input.PID = response.getJSON("propertyid");
//
input.Quick_Ref_ID = quickRefID;
input.Appeal_Tax_Year = taxYear;
input.Appellant = appellantName;
input.Appeal_ID = appealID;
input.Notice_Value = noticeValue;
input.Property_Owner = owner;
input.Property_Type = propertyType;
input.Legal_Descriprion = legalDescription;
input.Appellant_Address_1 = appellantAddress1;
input.Appellant_Address_2 = appellantAddress2;
input.City = appellantCity;
input.State = appellantState;
input.Postal_Code = appellantZip;
input.Type_of_Protest = typeOfProtest;
input.PID = input.PID;