Create contact from Maps
Haven't found this information elsewhere. It is straightforward once you know how to do it, but it certainly isn't at all clear in the UI.
IOS 17.0.3
Search for an address or business. When you find it choose "share". It gives you a list of the different ways to share as always, but in the lower panel it has "create new contact". It will create a new contact and leave you in edit mode. If it was a named location (e.g., "Safeway") that will be filled in but you can change it.