You must use a tool like 7-Zip or unxz to extract the .img from the .xz archive.
: A modified version of the Vendor Native Development Kit (VNDK). This specific variant is designed to work on devices where the standard VNDK might cause "read-only" issues or filesystem compatibility problems, making it easier to grant root access or modify the /system partition. system-roar-arm64-ab-vndklite-gapps.img.xz