How to append data to a json file on new line using Golang

Question

type dataOP struct {

    Opcode_name string `json:"opcode_name"`
    ExeTime     int    `json:"exeTime"`
}

func main() {

    book := dataOP{Opcode_name: "ADD", ExeTime: 5}
    byteArray, err := json.Marshal(book)
    if err != nil {
        fmt.Println(err)
    }

    f, err := os.OpenFile("./data.json", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
    if err != nil {
        fmt.Println(err)
        return
    }

    n, err := io.WriteString(f, string(byteArray))
    if err != nil {
        fmt.Println(n, err)
    }

}

I want to append data to a json file on new line using Golang. The above code appends the json object one after another, something like

{"opcode_name":"ADD","exeTime":5}{"opcode_name":"ADD","exeTime":5}{"opcode_name":"ADD","exeTime":5}

but i want to append these json objects in new line(json objects separated by new line).

{"opcode_name":"ADD","exeTime":5}
{"opcode_name":"ADD","exeTime":5}
{"opcode_name":"ADD","exeTime":5}