I don't know when it was enabled, but on Desktop if you click on the Grok icon on a Tweet, it will tell you all the context. It's been quiet useful to keep up with obscure posts that pop up.
This is one of my quickest adopted AI features. Twitter is one of the most opaque social media because of the character limit and the way it mixes different in-crowds in verbal combat, so explaining the context really makes it more fun to use. They just need to improve the feature with even more training. I feel there is usually one main obscure item that needs explaining and it often explains everything else.