LaTeX manuals for classes and/or styles in Guix

Does anyone know how can I install the LaTeX documentation for classes (.cls) and styles (.sty) in Guix (the PDF, PS, or DVI files). Apparently those are not installed by default. I have not noticed any documentation package in the texlive ecosystem.

Are there packages for such documentation?

Is there a switch for selecting the documentation for a package? (I already tried the package:doc option.)

How could I build such package or package option?