Gorm How to Smart Select Fields "struct in struct" ?

I have this struct

type UserData struct { Name string json:"name" Address struct { Country string json:"country" } json:"address" }

Error "invalid field found for struct /internal/models.User's field Games: define a valid foreign key for relations or implement the Valuer/Scanner interface"

In my Table have column

name | country

(I want this struct because I want to response json same as struct pattern)

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