Vaadin ARIA support

I read that Vaadin supports ARIA so I assumed I can easily set aria-label or aria-labelledby property. However, I cannot see such option. First example - Button component. It generates caption element but there is no aria info. How can it be achieved? How to generate ARIA info (label) for other components?

Adam

A late reply, but here’s a solution specifically for buttons:
https://vaadin.com/directory/component/ariabutton-add-on