Topic AI Summary can display its AI summaries on the Topic List via Excerpts on most of the Discovery lists as per the OP.
I’ve now built a small Theme Component that will allow you to toggle Excerpts (on or off) and you can set the default (on or off).
It respects Pinned. You can use it without this plugin. It works with Topic List Previews and the official Topic List Excerpts Theme Component.
Credit to Discourse Team for the idea. Made sense to implement it here and is a slightly different take, leveraging Excerpts.