I'm trying to create an array of objects in laravel php. So far I have achieved this.

When I return the array I get the response, I added the image for clarity.

I get this output

I want to create a response like this...

[
    {
        "student": "Jaime Thomas",
        "subjects": [
            {
                "subject": "Physics",
                "marks_": 0
            },
            {
                "subject": "Chemistry",
                "marks_": 0
            }
        ]
    },
    {
        "student": "Jaime Dey",
        "subjects": [
            {
                "subject": "Physics",
                "marks_": 0
            },
            {
                "subject": "Chemistry",
                "marks_": 0
            }
        ]
    }
]

$usersData = User::where('user_id', 2)->where("stud_class", $exam_details->exam_class_id)->where("XXXX", $exam_details->exam_branch_id)->get();
            foreach ($exam_data as  $subject) {
                $att_exams =  MODEL::where('XXXXX', $subject->subject_id)
                    ->where('XXXX', $user->id)
                    ->first();
                if ($att_exams) {
                    $marks =  MODEL::where('XXXX', $att_exams->attended_exams_id)->get();
                    $right = 0;
                    $wrong = 0;
                    $total_marks = $marks->sum('XXXX');
                    
                    $total_negative_marks = $wrong * $subject->negative_marks;
                    $subjectsArray[] = array(
                        "subject" => $subject->subject_name,
                        "marks_" => $total_marks - $total_negative_marks,
                    );
                } else {
                    $subjectsArray[] = array(
                        "subject" => $subject->subject_name,
                        "marks_" => 0,
                    );
                }
            }
            $studentsArray["subjects"] = array($subjectsArray);
        }
        return $studentsArray;