The other day, I wrote about John Kitchin’s experiment with bringing f-strings to Elisp. In the comments, Noonian Atall pointed to Alphapapa’s format$ macro that does the same sort of thing. I just saw a reddit post from alphapappa announcing that he had enhanced format$ to include interpolated sequences just like f-strings.
The format$ macro is part of alphapappa’s elexandria library that brings some of the features of Common Lisp’s Alexandria library to Elisp. If you’re interested in f-strings, you should take a look.