How to get struct from map - elixir?

Wow, I’m pretty surprised that this isn’t built in, or at least available as part of Phoenix since incoming json data is not exactly an unexpected occurence in that context. Sure, it’s simple to manually add, and I understand the point about using strings instead of atoms for external data. Still, from an ergonomic point of view it’s super weird because it forces you to repeat your attributes (and makes refactoring harder).

Or maybe I’m missing something? I’m still very much a newb when it comes to Elixir.