Not sure I understand the question? Do you want to upload the JPG format only of EPS generated files? If so, just upload it as JPG and they will be considered like any other JPG files.
If you want to upload EPS, you can simultaneously upload the JPG generated file of the EPS (both must have the same name, but will obviously have different extensions). Their system will combine the meta data from the JPG and add it to the EPS file.