Agile toolkit atk4 php set field value based on anther field value without submitting the form

I am using agile toolkit code for developing an application , i do have dropdown that get values from database, I want to show selected value from field 1 to field 2 without submit any thing.
    

$form->addField('field1', ['caption' => 'Field 1', 'DropDown', 'values'=> $arra1,'isMultiple' => true ,'readonly' => false, ['dropdownOptions' => ['fullTextSearch' => true]]]);

$form->addField('field2', ['caption' => 'Select Specfic Values', 'DropDown','model' => new view_values($db),'dependency' => function (view_values $model, $data) {isset($data['field1']) ? $model->addCondition($model->fieldName()->id, 'like', '%' . $data['field1'] . '%') : null;} ,'isMultiple' => true ,'readonly' => false, ['dropdownOptions' => ['fullTextSearch' => true]]]);

issue is Fatal Error atk4\ui\Exception: Unable to add form field (), object: atk4\ui\FormField\DropDown () property: "dependency" value: {}. Looking for Help. maybe my logic is wrong.

I have managed to find a solution for 2 field multi selection scenario:

$values = new view_table($db);
$values->addCondition($db->dsql()->orExpr()->where($db->dsql()->
andExpr()->where('field_status','<>','1')));

$Array = array();
reset($Array);
foreach($values as $row){

$Array[$row['id']] = $row['field_1'].": ".$row['field_2'];

}

$fieldvalue_1 = $form->addField('fieldvalue_1', ['caption' => 'fieldvalue_1', 'DropDown', 'values'=> $Array,'isMultiple' => true ,'readonly' => $readonly, ['dropdownOptions' => ['fullTextSearch' => true]]]);

$fieldvalue_2 = $form->addField('fieldvalue_2', ['caption' => 'fieldvalue_2', 'DropDown', 'values'=> $Array,'isMultiple' => true ,'readonly' => $readonly, ['dropdownOptions' => ['fullTextSearch' => true]]])->set($_GET['val'] ?? 'No value');
$fieldvalue_1->js('change' ,new \atk4\ui\JsReload($fieldvalue_2,['val' => $fieldvalue_1->jsInput()->val()]));