Since I'm a daily Spotify user and based on my own experience, I would love if a "select your favs seconds" feature exists, because sometimes you just want to listen to a specific part of the song/podcast, so it would be cool if we had a feature that allows us to select the beginning and the end of our favorite parts, also adding them to our playlist.
And for the artists, a playlist by Spotify named as "fans favs", includes the parts that the fans select the most and listen to them repeatedly ranked from top 1.
I also asked my friends and some people online who use Spotify too and they also find this feature will be a problem solver for millions of users and a great feature to simplify users experience.
This is the prototype of the idea I made. I hope it corresponds to your future projects.