This is the documentation for ariaAttributes config -
ariaAttributes
An object containing ARIA attributes to be set on this Component's ARIA element. Use this to set the attributes that cannot be determined by the Component's state, such as aria-live, aria-flowto, etc. Note that this config is only meaningful at the Component rendering time, and setting it after that will do nothing.
It's not working, when I tried to use it with Component. See fiddle - https://fiddle.sencha.com/#view/editor&fiddle/3qp5
Is there any override, anyone is using, to make this config work?