No that seems to be indeed a native part of the multimodal Gemini model. I didn't know this existed, it's not available in the normal Gemini interface.
This is a pretty good example of the current state of Google LLMs:
The (no longer, I guess) industry-leading features people actually want are hidden away in some obscure “AI studio” with horrible usability, while the headline Gemini app still often refuses to do anything useful for me. (Disclaimer: I last checked a couple of months ago, after several more of mild amusement/great frustration.)
That's pretty disappointing, it has been out for a while, and we still get top comments like (https://news.ycombinator.com/item?id=43475043) where people clearly think native image generation capability is new. Where do you usually get your updates from for this kind of thing?