i have problem when i inserted data from another table in laravel 11, i using checkbox for show data in the form. so can you help me please?
this is my blade

                    @if(count($ujians) > 0)
                        @foreach($ujians as $ujian)
                        <!-- tambah soal-->
                        <div class="modal" id="tambahsoalModal{{$ujian->id}}" data-backdrop="static" data-keyboard="false" tabindex="-1" aria-labelledby="staticBackdropLabel" aria-hidden="true">
                            <div class="modal-dialog">
                                <div class="modal-content">
                                    <div class="modal-header">
                                        <h5 class="modal-title">Tambah Soal</h5>
                                    </div>
                                    <form action="{{route('tambahSoalUntukUjian')}}" id="tambasoal" method="POST">
                                        @csrf
                                        <div class="modal-body" role="document">
                                            <input type="hidden" name="id_ujian" value="{{$ujian->id}}" id="tambah_idujian">
                                            <label for="" class="form-control-label">Pilih Soal Ujian</label>
                                            <input class="form-control" type="search" name="search" placeholder="Cari soal ujian">
                                            <table class="table">
                                                <thead>
                                                    <tr>
                                                        <th></th>
                                                        <th>Pertanyaan</th>
                                                    </tr>
                                                </thead>
                                                <tbody class="tambahBody">
                                                   
                                                    @foreach($soals as $soal)
                                                    <tr>
                                                        <td>
                                                            <input type="checkbox" name="id_soal" value="{{$soal->id}}">
                                                        </td>
                                                        <td>
                                                            <a name="{{$soal->id}}"> {!!$soal->pertanyaan!!}</a>
                                                        </td>
                                                    </tr>
                                                   @endforeach
                                                   
                                                </tbody>
                                            </table>
                                            <div class="modal-footer">
                                                <button type="button" class="btn btn-secondary" data-dismiss="modal">Tutup</button>
                                                <button type="submit" class="btn btn-primary">Simpan</button>
                                            </div>
                                        </div>
                                    </form>
                                </div>
                            </div>
                        </div>
                        @endforeach
                        @endif

this is my controller

    public function tambahSoalUntukUjian(Request $request){
        try{
            
            Soaljawaban_ujian::insert([
                'id_ujian'=>$request->id_ujian,
                'id_soal'=>$request->id_soal
            ]);
                
            return response()->json(['berhasil'=>true,'msg'=>'Tambah Soal ujian berhasil']);
        }catch(Exception $e){
            return response()->json(['success'=>false,'msg'=>$e->getMessage()]);
        }
    }