I've got file template.php, that is included in CBitrixComponentTemplate's method.
CBitrixComponentTemplate has property $this->__component, that is dynamicly filled with object EtmOrderAdd. EtmOrderAdd has property objValidator.
Now, when I am writing the file template.php, I need all these properties to be understood by phpDoc.
Here's the picture, illustrating my idea :

How should I write it?
@propertyonly works when used in PHPDoc for THAT class -- it will not work the way you are trying to use it. Since I'm not familiar with Bitrix at all, my only suggestion right now would be to introduce intermediate variable and use it instead (and for such case ordinary@varwill work)