Anyone know if there are tie downs, hooks, eye bolts or something similar available for Audi roof racks?

I’m looking for something that would attach to the rack bars; be removable/adjustable; and could take a hook from a ratchet strap or have a rope tied through it.

So far my searches haven’t shown anything, certainly not through Audi which only seems to have bike carriers, ski/snowboard carriers, and roof boxes.