Google might be trying another feature in search for its featured snippets & Knowledge panels to read the content for you. Manikandan shared a screen shot with Barry Schwartz on Twitter of Google Search showing a button that peruses “Hear This Out Loud” in the featured snippet box enclose in Google Search.
Here is the Tweet shared by Manikandan
Is this because of the Speakable (BETA)?
Is this any test or an existing feature?
— Manikandan N (@ManikandanNSEO) May 25, 2021