Sure, you can do so. We suggest you do this procedure on the floor prior to hanging the chandelier. That way you can coil up each wire well and you do not damage any of the wires.

If you try to push the wires through once the chandelier is on the ceiling it might fray a wire.

It's best to do this on the ground. You can measure each wire easily and determine how much you want to push this up the canopy.