Hello I have the following and not sure how I would do a countrie dropdown list similar to the freelancer Registration on upwork.

package com.service.auth.model.auth;


import com.fasterxml.jackson.annotation.JsonProperty;
import javax.validation.constraints.Email;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Size;
import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
public class SignInRequest {
    @NotBlank
    @Size(max = 128)
    @Email
    private String email;




    @NotBlank
    @Size(max = 30)
    @JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
    private String password;

}