Grouping by parent in a Select component

    public function customOptionTypes(): BelongsToMany
    {
        return $this->belongsToMany(CustomOptionType::class, 'brief_custom_option_types', 'brief_id', 'custom_option_type_id')
            ->withTimestamps();
    }

  public function customOption(): BelongsTo
  {
      return $this->belongsTo(CustomOption::class);
  }

 Select::make('Custom Options')
                        ->label('Custom Options')
                        ->preload()
                        ->searchable()
                        ->relationship('customOptionTypes', 'name')
                        ->multiple(),