You can embed metadata to a JPEG picture (.jpg, .jpeg) image using Photoshop Lightroom, but there is probably no way how you could perform xmpf to jpg conversion directly.
Unfortunately, we do not know about any possible way to convert xmp to jpg or about any different xmp to jpg conversion.
This conversion entry was verified by us and conversion was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it is not possible because incompatibility between programs, caused by closed file formats, very limited support etc.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion below with as much as information as possible so we can fix it.