When generating a PDF QR code it is indeed possible to add the URL of the asset which includes the Asset ID, while this same option isn't available for JPG QR codes. JPG QR Codes were intended to be printed out to be attached to the physical asset. As outside of the database an asset ID is just a number without much meaning, we determined it wouldn't have much value to add it to QR Codes. The option to add the URL under PDF QR codes was added as PDF QR codes were likely to also be consulted digitally.
We've moved your post to the Lansweeper wishlist section of our forum and have added an item to our customer wishlist for adjustments to the JPG QR Code, to allow the option to add either the URL or just the Asset ID underneath the QR Code. At this moment in time we cannot yet guarantee that this change will be implemented though and we cannot provide you with an estimated release date.