Providing you an static way to get the specific value of array key. You can pass it like this:
setTemplateVars(['details' => $arr[0]->key1]) //get key1 value from array 0 setTemplateVars(['details' => $arr[1]->key1]) //get key1 value from array 1 Using foreach loop
foreach($arr as $detail){ setTemplateVars(['details'=> $detail["key1"]);}
<?php foreach($arr$details as $detail){ : ?> setTemplateVars(['details'=> <p>{{trans ' %val' val = $detail["key1"]); }}</p> <?php endforeach; ?>