In RelationshipManager modal form, how I can validate Repeater form

Please advise how I make a proper livewire->validate() the Repeater Data form.
The data is in array as $data['transfer'] . At the moment I just made if(!blank($transferData['from_id']) ...
I would like to use $livewire->validate(
'to_id'=>['required'],
)
but how to put Repeater in to validate
->headerActions([
                    ->action(function ($data, RelationManager $livewire) {
                        if ($data['transfers']) {
                            $employee = $livewire->getOwnerRecord();
                            foreach ($data['transfers'] as $transfer) {
                                if (!$livewire->validateForm($data, $transfer)) return;
                                $newRecord = new Transfer();
                                $newRecord->from_id = $transfer['from_id'];
                                $newRecord->to_id = $transfer['to_id'];
                                $newRecord->transfer_type = $transfer['transfer_type'];
                                $newRecord->employee_id = $livewire->getOwnerRecord()->id;
                                $newRecord->transfer_date = $data['transfer_date'];
                                $newRecord->effective_date = $data['effective_date'];
                                $newRecord->before_detail = EmployeeResource::getEmploymentDetail($livewire->getOwnerRecord());
                                $records[] = $newRecord;
                                $fieldId = strtolower(Str::snake(class_basename($transfer['transfer_type']))) . '_id';
                                $employee->$fieldId = $transfer['to_id'];
                            }
                            $livewire->updateAfterDetail($records, $employee);
                            $employee->save();

                        }
                    })
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