Get current form values

<?php

namespace App\Filament\Resources\TicketResource\RelationManagers;

use App\Filament\Resources\TaskResource;
use Filament\Forms\Form;
use Filament\Resources\RelationManagers\RelationManager;
use Filament\Tables;
use Filament\Tables\Table;
use Illuminate\Database\Eloquent\Model;

class TasksRelationManager extends RelationManager
{
    public function isReadOnly(): bool
    {
        return false;
    }

    protected static string $relationship = 'tasks';

    public static function getTitle(Model $ownerRecord, string $pageClass): string
    {
        return trans('task.resource.label');
    }

    public function getTablePluralModelLabel(): string
    {
        return trans('task.resource.label');
    }

    public function getTableModelLabel(): string
    {
        return trans('task.resource.single');
    }

    public function form(Form $form): Form
    {
        return TaskResource::form($form)
            ->columns(1);
    }

    public function table(Table $table): Table
    {
        return TaskResource::table($table)
            ->headerActions([
                Tables\Actions\CreateAction::make()
                    ->mutateFormDataUsing(function (array $data, RelationManager $livewire): array {
                        $data['customer_id'] = $livewire->getOwnerRecord()->customer_id;
                        return $data;
                    })
                    ->slideOver(),
            ])->filters([
                Tables\Filters\TernaryFilter::make('is_processed')
                    ->label(trans('task.resource.processed')),
            ]);
    }
}