The control name is ItemTooltip. Its methods are listed in official ZOS API documentation, it's a little tedious to make it work with items from different places, as there are distinct methods for setting an item from bag/bank/mail attachment/store/link, etc.
There are multiple add-ons working with that already, you can check how they do it.
I've been using two:
Harven's Trait And Style (doesn't add to the bottom, but the idea is the same)
Sous Chef (currently unmaintained, I think, but Master Recipe or how it's called probably has a similar feature)
Some I don't use but remember they add/added something to tooltips: Inventory Insight,
Crafting Materials Level Display, various guild store price trackers...
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