Maybe the info is not available anywhere because it is just too variable... i.e. depends on the particular cow the beef fat came from. Then again, I've always wondered how any nutrition guides could give generalized info on the calories from fat and calories from protein on something like beef anyway since every piece of meat is visibly different with some a lot more marbled than others. I've always figured that they just take a bunch of samples and then give us an average. Seems like they could do that with unrendered beef fat as well.

But maybe nobody has ever bothered because very few people consume unrendered beef fat. Just cooking it is going to separate out (render) a lot of the fat content.