How can I make all fields in the generated interfaces nullable without adding the @Nullable annotation?

Java Class:
```java
@Getter
@Setter
public class User {
   private Integer id;
   private String name;
   private Integer age;
}
```

Excepted generated output:
```typescript
export interface User {
    id?: number;
    name?: string;
    age?: number;
}
```
How should I configure to add a questionMark to all fields?