Trim the zipper tails off till just after the zipper stop.
Then fold one side of the zipper tape to the back, and then the other. Slide your zipper in the zipper end for a test fitting. Fits good?
Pull the zipper back out and add some glue inside that adheres to metal and fabric, such as Gütermann creative HT2, Beacon 3-in-1, E-6000, or some Aleene’s products.
Refold the zipper and slide it back in.
With an awl or stiletto, push trough the hole of the zipper end (make sure you do not slide and scratch the metal). This way we help to make room for the screw and are sure the screw goes through the zipper and is not just pushing against it.