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Structured data alone is not a load-bearing voice-SEO lever. Speakable and related types exist; a general visibility claim does not.
What exists, narrowly?
Google has documented types and properties aimed at spoken surfaces in the past. Those documents are feature-specific. They are not a standing promise that FAQ, HowTo or Article markup will be read aloud, or that a page will be selected as a voice answer because it has an ld+json block.
What is this based on?
There is no general, current Google commitment that schema markup leads to better voice-search presence.
What should you do instead?
Write the answer in the delivered HTML. Keep the entity unambiguous. If a spoken-result type is still in the live feature list and the page is actually that type, mark it up. Do not invent a voice-SEO programme on top of markup Google does not currently attach to voice surfaces.
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Elsewhere on this site Entity grounding · Semantic search · Named entity recognition · Client-side rendering check · Large language models · Answer engine optimization · Generative engine optimization · Evidence · E-E-A-T