Is there currently (2019/10, or in the HTML "living standard") a "standard" way to alert assistive tech users that audio content is available for a given article/page of text?

E.g., the opposite of a podcast transcript. Instead of providing text for audio, I am looking for a way to alert assistive tech that audio exists for a given text.

Is this a thing?

Note: I see that the WCAG Checklist states:

If the audio or video is designated as an alternative to web content (e.g., an audio or sign language version of a web page, for example), then the web content itself serves as the alternative.

And perhaps that is my answer? That providing an "audio" version of something implicitly links it to the text provided? Am I understanding that correctly?