Extend package and use generated $expectedArgumentSets

Question:

I have my custom site_route helper and I want PHPStorm suggestions, like it does with route method. I've created custom meta file:

namespace PHPSTORM_META {

    expectedArguments(\site_route(), 0, argumentsSet('routes'));
}

but looks like routes argumentSet from the package's .phpstorm.meta.php file is not available here. Can I somehow realize this, without writing custom argumentSet generation?