Yes, but they’re generally not hard to come by. Many of the device manufacturers make the factory images available for download on their support site, and those would have the necessary images and blobs.

Or, if there’s an unofficial build for your device they would be included there.

If you’re able to unlock your bootloader and then load a compatible recovery, you can take a “nandroid” image of the device to offload to your PC. The blobs would be encoded in there, you’d just have to sort out extracting the right files from the right backup files.

So, you’ve got a few options.