Schema
Speakable specification
Also: SpeakableSpecification, speakable schema, voice search schema
Speakable was designed for news content read aloud by Google Assistant. Outside that case it does little. It is harmless to keep and not worth adding for AI visibility.
The time is better spent making the page itself clear: a plain answer near the top, the key facts in visible text, and the content present in the HTML.
Sources
- Google documents Speakable as a beta feature for news content (Google Search Central, "Speakable (SpeakableSpecification) structured data").