How to create join table with JPA annotations?

I need to create a join table in my database using JPA annotations so the result will be this:

So far I just implemented 2 entities:

@Entity
@Table(name="USERS", schema="ADMIN")
public class User implements Serializable {

    private static final long serialVersionUID = -1244856316278032177L;
    @Id 
    @Column(nullable = false)
    private String userid;  
    
    @Column(nullable = false)
    private String password;

    public String getUserid() {
        return userid;
    }

    public void setUserid(String userid) {
        this.userid = userid;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
    
}

@Entity
@Table(name="GROUPS", schema="ADMIN")
public class Group implements Serializable {

    private static final long serialVersionUID = -7274308564659753174L;
    @Id
    @Column(nullable = false)
    private String groupid;
    
    public String getGroupid() {
        return groupid;
    }
    public void setGroupid(String groupid) {
        this.groupid = groupid;
    }
}

Should i create another entity called USER_GROUP or i can just add some annotations, so the join table will be created automatically when i run create tables from entities(ORM)?

How should i annotate my entities to achieve the same as in the image?