How to remove item key from repeater on save to json

Fieldset::make('Schedule Config')
            ->schema([
                Repeater::make('schedule_config.monday')
                ->schema([
                    TextInput::make('time_range'),
                ]),
                Repeater::make('schedule_config.tuesday')
                ->schema([
                    TextInput::make('time_range'),
                ]),
                // other days...
            ])->columns(1),

{"friday": [], "monday": [{"time_range": "09:00-12:00"}, {"time_range": "13:00-18:00"}], "sunday": [], "tuesday": [], "saturday": [], "thursday": [], "wednesday": []}

{"friday": [], "monday": ["09:00-12:00", "13:00-18:00"], "sunday": [], "tuesday": [], "saturday": [], "thursday": [], "wednesday": []}

Schedule::create([
    'monday'            => ['09:00-12:00', '13:00-18:00'],
    'tuesday'           => ['09:00-12:00', '13:00-18:00'],
    'wednesday'         => ['09:00-12:00'],
    'thursday'          => ['09:00-12:00', '13:00-18:00'],
    'friday'            => ['09:00-12:00', '13:00-20:00'],
]);