"This feature is frontend specific, is that right? On which frontend did you use to achieve this amazing result?"

PEAKD created the concept of a Curated Content Collection (CCC), so that's where I assembled this one. One might be able to create a CCC on other front-ends, but I am not entirely sure about that. The essential elements seem to be publishing to the C-C-C community page and keeping a particular invisible placeholder in the post, but there might be more to it than that, I dunno. Staying with the original front-end that created the concept is safer, imho.

You can see how the CCC was designed to be rendered:
• click to see it on PEAKD

Ecency doesn't do a bad job of displaying a CCC:
• click to see it on ECENCY

Hive.Blog shows the links, but not the thumbnails of the posts:
• click to see it on HIVE.BLOG

To create your own CCC, start a post in PEAKD, and click the "ADVANCED" button beneath the editor box. Toggle the switch to "YES" beside the option of converting your posts to a Collection of posts:

Then, the body of your CCC will look like this:

Don't touch the "placeholder" line! Leave it alone!
But all the other lines that are showing •••instructions••• should be deleted and replaced with the appropriate links, text, etc. Also, the "description" after each link is optional. I did not use any "description" line in this CCC because I thought my post titles were descriptive enough. To see how descriptions might be helpful, go to my Blog page on PEAKD, click on "Collections," then select the one about "Security." 🙂