Whether this renderer's content is included in the automatically generated accessibility
hierarchy. The default value is true.
This property only takes effect while the experimental Generate Accessibility Hierarchies for Runtime Panels setting is enabled in Project Settings > UI Toolkit. An opted-out renderer contributes nothing to the generated hierarchy, including the content of any nested Panel Renderers. Changing the value on a live renderer adds or removes its content in place, without rebuilding the rest of the generated hierarchy.