Hi,
To do that, you need to develop a plugin of the group "system" implementing the event onMailBeforeRendering($id,&$templateObj)
You need to check that $id is equal to com_users.registration.admin.verification_request.
Then, you can initialize HikaShop by requiring HikaShop's main helper file.
Then, you can load the data of the address of the current user:
$user_id = hikashop_loadUser();
$addressClass = hikashop_get('class.address');
$addresses = $addressClass->getByUser($user_id);
$oneAddress = reset($addresses);
And then you can use
$templateObj->addTemplateData(array('key1'=>'value1','key2'=>'value2'));
And then in your email template, you can use {key1} and {key2} and they will be replaced by value1 and value2.