Create record with already prepared key

I have a simple model:

    @Entity
    @Table(name = "doctor_data")
    public class DoctorData {
    
        @Id
        @GeneratedValue(strategy = GenerationType.SEQUENCE)
        @Column(name = "doctor_id")
        private int id;
    
        @Column(name = "first_name", nullable = false)
        private String docName;
    
        @ManyToOne
     

       @JoinColumn(name = "user_id")
        @JsonBackReference
        private User user;
      }

How can I pass the prepared value in "user_id" foreign key due DTO, or simple post request?