Re: nvda and buttons
You may, and I emphasize may, be able to use the Golden Cursor add-on to accomplish what you're hoping for within specific application (which, I'd imagine, would include a web browser on a specific webpage). See the NVDA+SHIFT+I command to add a tag or label based on the mouse position. You'd still need to use Golden Cursor later to access the label, but you'd have it and know it's there.
It's a workaround, but depending on how important it is, it's a possibility.
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
Science has become just another voice in the room; it has lost its platform. Now, you simply declare your own truth.
~ Dr. Paul A. Offit, in New York Times article, How Anti-Vaccine Sentiment Took Hold in the United States, September 23, 2019