I cannot figure out how to initialize structure field when it is a reference type alias of the one of the number types:

```
package main

import (
  "fmt"
  "encoding/json"
)

type Nint64 *int64

type MyStruct struct {
   Value Nint64
}

func main() {
  data, _ := json.Marshal(&MyStruct{ Value : ?? 10 ?? })
  fmt.Println(string(data))
}

```