No — not to appear in Google's AI Overviews or AI Mode. Google explicitly lists llms.txt among the things site owners can ignore. We detect whether you have one and store it as a data point, but we deliberately don't score it, because scoring it would imply it does something it doesn't.
If someone's selling you AI visibility on the strength of adding special text files or "AI-readable formatting," that's the hack-selling we built VizyReport to be the alternative to.