Storing repeater data in a pivot table

 public function diplome_expert(): BelongsToMany
    {
        return $this->belongsToMany(Diplome::class)
            ->withPivot('year', 'specialite_id', 'etablissement_id')
            ->withTimestamps();
    }

Forms\Components\Section::make('Diplômes universitaires obtenus')                ->schema([                        Forms\Components\Repeater::make('diplome_expert')->label('Diplômes universitaires obtenus')                                      
->relationship()
->schema([                                     Forms\Components\Select::make('diplome_id')->options(fn() => Diplome::pluck('name_fr', 'id')->toArray())->searchable()->label('Diplome'),
                                        Forms\Components\TextInput::make('year')->label('Année'),

Forms\Components\Select::make('specialite_id')->options(fn() => Specialite::pluck('name_fr', 'id')->toArray())->searchable()->label('Spécialité'),
  Forms\Components\Select::make('etablissement_id')->options(fn() => Etablissement::pluck('libelle_fr', 'id')->toArray())->searchable()->label('Etablissement'),

])->defaultItems(1)->createItemButtonLabel('Ajouter un autre dilpome universitaitre')->columns(2)->collapsible()->required(),
     ])->collapsed(),

]),