import (
  "encoding/json"
  "github.com/jinzhu/gorm/dialects/postgres"
)

type Home struct{
    HomeID     string `gorm:"type:varchar(65);primary_key"`
    Address    string `gorm:"type:varchar(200)"`
    Location   postgres.Jsonb `sql:"type:JSONB NOT NULL DEFAULT '{}'::JSONB"`
}

type Coordinates struct{
    Latitude  float64 `json:"latitude"`
    Longitude float64 `json:"longitude"`
}

db.Create(&Home{
  HomeID: "someid",
  Address: "someaddress",
  Location: Postgres.Jsonb{json.RawMessage(`{"latitude":1, "longitude":2}`)},
})