It is usually accompanied by review swapping and ratings as that is essential. Anyway, for shoutout, you just recommend some elses work in a chapter of yours. Like in the author notes.
:blob_aww: If it is one chappy, I recommend chapter 1 rather than the prologue.
https://www.scribblehub.com/read/121764-schwarz--der-wille-zur-macht/chapter/121965/