How to extend smarty plugin

Hello,
can you tell me please if is it possible to extend smarty plugin for PhpStorm?
I use it with latte templates which use n: macros like
<div n:inner-foreach="$articles as $article" n:class="isset($error) ? error">
The only problem is that smarty does not know n:makro attributes in html tags.
I have a dream that will be possible to define custom(non standart) attributes in settings dialog window which will be accepted as html attributes. I think it is possible. Isn't it?

Thanks.

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