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Let your chickens see the treats in your hand so they approach you. Continue to do this around 2-3 times a day so your chickens associate food with the bridge noise. Make sure you're making your bridge noise first and giving them treats immediately after. Watch your chickens reactions after you bridge. If they perk up and approach you like they're waiting for food, the training is working. Give them the treats after they've come to attention and approached you. If your chickens aren't associating your bridge noise with food, keep training them until they do. It could take several weeks for all of your chickens to get there. Make sure all of your chickens are adequately trained before you let them out. If one chicken doesn't associate your bridge with treats, that chicken won't respond when you try to call the flock back to their coop. You may need to make it several times so all the chickens hear it. When the chickens return, give them their treats. If any of your chickens don't respond to your bridge noise, go collect them and bring them back to the coop. Keep training them until they make the connection.
Make your bridge noise and give your chickens a treat. Start hiding the treats while making your bridge noise after a few days of training. Let your chickens roam free once they associate your bridge noise with food. Make the bridge noise when you're ready for your chickens to come home.