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Unified Service Desk: get context from screen and put in $Return replacement parameter using javascript

I am trying to read some context from a webpage and put it in the $Return replacement parameter.

I'm following the method described here:

https://blogs.msdn.microsoft.com/usd/2016/05/04/exchange-information-between-unified-service-desk-and-standard-web-applications/

The following code still worked and was successfully written to the $Return replacement parameter:

function GetCustomerData(){
var klantnumber = document.getElementById("RichWidgets_wt3_block_wtMainContent_wt12").value;
return klantnumber;
}GetCustomerData();

However, since I want to also store another parameter in my context and I cannot store multiple parameters here I tried to mold this into an array or an object, both of which do not work:

Return as an array:

function GetCustomerData(){
var klantnumber = document.getElementById("RichWidgets_wt3_block_wtMainContent_wt12").value;
var accountnumber = document.getElementById("RichWidgets_wt3_block_wtMainContent_wt13").value;
var person = [klantnumber, accountnumber] ;
return person;
}GetCustomerData();

Return as an object:

function GetCustomerData(){
var klantnumber = document.getElementById("RichWidgets_wt3_block_wtMainContent_wt12").value;
var accountnumber = document.getElementById("RichWidgets_wt3_block_wtMainContent_wt13").value;
var person = {};
person.klantnr = klantnumber ;
person.accountnr= accountnumber ;
return person;
}GetCustomerData();

Is there a way to write multiple parameter to the $Return replacement parameter?

Thanks in advance!

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