Let's imagine we have this JSON:

{
	"name": {
		"first": "John",
		"last": "Doe"
	}
}

And a developer wants to unmarshal it into this struct:

type person struct {
          FirstName string
          LastName  string
}

I think using something like the syntax below would make doing the decoding process a lot easier without the need of a custom unmarshaler or using any external packages and would be a life saver when you have big JSON strings with dozens of nested data.

type person struct {
          FirstName string `json:"name.firstname"`
          LastName  string `json:"name.lastname"`
}