Collection variable in Staff Order Notifications template

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I am using Shopify Lite with "Buy button". I have 2 collections and few products in each. Those two collections are integrated to Squarespace website into two different sub-pages and are working as two separate webshops. I am editing "Settings" -> "Notifications" -> "Staff order notifications" -> "New order" template and wondering how to get Collection name inside it for purchased products? It will be just one collection name, but also it can be collection name for each product. Can anyone provide me correct variable ore liquid code to get it?
Many thanks.