In Magento 1 I sometimes used this way to pass an argument to a category, directly from the back office
Category > Custom Design tab > XML Design Update
<reference name="product_list"> <action method="setData"><key>giftCardId</key><value>955</value></action> </reference>
Could you tell me what will be the equivalent syntax in Magento 2, Using the same way:
Category > Design > Layout Update XML
The main idea is to pass a value for a specific category, that could be retrieved in a custom module in frontend.
Edit: I know that I can add a custom category attribute to do that too, but the point is really, does an equivalent syntax exists.