I am not aware of any theme that does this out-of-the-box so it will require a bunch of font-end customisation.
However most of the extensions are pre-built by established authors and can be tweaked to show up on the front-end.
From what I recall, an example of this being done is on brickzip(dot)com which uses flarum.
They've used the following extensions:
For title, post summary and using image or video as featured image, you could use IanM's synopsis extension:
https://discuss.flarum.org/d/25772-synopsis
Davwheat's Share:
https://discuss.flarum.org/d/29074-davwheat-share-posts
Clarkwinkelmann's Discussion bookmarks:
https://discuss.flarum.org/d/25357-discussion-bookmarks
IanM Views:
https://discuss.flarum.org/d/24002-flarumite-simple-discussion-views
Dark mode FriendsOfFlarum:
https://discuss.flarum.org/d/21492-friendsofflarum-night-mode
The replies is already apart of the front-end so the reply icon can be repositioned to the bottom with front end modifications
