Why can't fields be automatically filled in when creating?

[myadream]

Case：

user := User{
  Name: "one",
  Email: "1@1.com"
}

ent.User.Create().Fill(user).Save()

or

user := map[string]string{
"Name": "one",
"Email": "1@1.com"
}

ent.User.Create().Fill(user).Save()