result.discussionsAndForums, on desktop and mobile, with no flag and at no extra cost. discussionsAndForums is omitted when the SERP has no Discussions and forums block.

Discussions and forums in Google Search
expanded says which one is open.
The block’s “See more” link opens Google’s Forums tab, a separate search, and is not followed. Google can cite the same post in the “What people are saying” block too; it is then in both result.peopleAreSaying and result.discussionsAndForums.
Discussions and forums structure
Thread
position, title, link and expanded are always present. source, extensions, answers and redirectLink are included only when Google shows them.
Extensions
The line under the source usually holds the community, the number of comments or answers and the date (["r/reactjs", "120+ comments", "3 years ago"]). Google leaves out each item it has no value for, and the page does not label them, so an item’s place in the list does not tell what it is: ["30+ answers", "2 years ago"], ["r/smartphone_specs_edu", "1 year ago"] and ["2 months ago"] are all possible. The items keep the language and the format of the SERP ("3y" on mobile).
Answer
Google shows the top answers of the thread, or, when it has none to show, one excerpt of the thread. Google cuts long text with ”…”.Response example
A response toreact vs vue, on desktop: