Looks like ifixit doesn't have ball end hex bits but perhaps you could use something like these (examples only) in conjunction with the 1/4" to 4 mm Driver Adapter in the kit.
Here's an image taken from the ifixit Mako Driver Kit - 64 Precision Bits tool kit which I assume is the one you're referring to, showing the location of the 1/4" → 4mm driver adapter in the kit.
It's a bit hard to see but under each bit is an embossed description of what the bit is. You can see them more clearly in the zoomed in image I posted below. Why they didn't have the description in a different colour e.g. white, I don't know.
Also in the link for the toolkit I posted on the right side of the page is a link that shows the kit contents.
(click on image above)