Children Meals: Multiple Many-to-Many Checkbox Lists in One Form

We have a Filament resource to show a list of kindergarten groups.

app/Filament/Resources/Groups/Tables/GroupsTable.php:

use Filament\Tables\Table;
use Filament\Tables\Columns\TextColumn;
 
public static function configure(Table $table): Table
{
    return $table
        ->columns([
            TextColumn::make('name'),
        ])
        // ...
}

We added an action to the table to assign meals (breakfast, lunch, or dinner) to kids in a group.

When the action is triggered, a modal slides out with a list of kids and meals for each kid. A form is generated manually for each kid and meal.