No problem. I'm in the same boat as you but for Swift 5. It's ridiculous, no documentation on Power Delivery. I have read so much about Power Delivery stuff on Type-C the past week or so, I feel like I'm studying to be an electrical engineer. I have looked at various chargers too online and unless there are confirmed users for your exact laptop model, best to avoid unless they have a very good return policy. Innergie Powergear seem to work on various new laptops including some Acer models with the same power rating but no indication on Swift 3. Plugable USB-C docking station with power delivery is double the money but has multiple ports for home use. I am looking for a portable one for travel, if Swift 5 Type-C can take in power delivery...
Good luck.