Your XPS 9520 will come with either Windows 10 or Windows 11. Even if you wipe the drive, even if you replace the drive and install Windows on a new drive in the same laptop, your system will still be licensed. When you use Microsoft's Media Creation Tool to create a bootable flash drive with Windows installer and then perform a new Windows install, your licence will automatically activate once connected to the Internet. There is no need for special installation media from Dell, and in fact they likely no longer provide any since you can always download from Microsoft.  
If I download Windows installation media from Microsoft, will Windows recognize a license from Dell? I'm looking at an XPS 9520. I know it use to be the case that Windows (from Microsoft) did not recognize licenses obtained through a PC vendor (Dell). Users reinstalling Windows had to obtain special installation media from their vendor. Are things different now in 2023?
Will Windows Obtained From Microsoft Recognize Dell's License?