Lisp has a standard term for these things of which you speak: locatives.  Zetalisp, the pre-CL of the Lisp Machine, had low-level locatives documented at <https://hanshuebner.github.io/lmman/fd-loc.xml>.  Locatives were removed from CL because they were considered not portable enough, but there is a portable package cl-locatives at <https://quickref.common-lisp.net/cl-locatives.html>.