I think I get my answer here, section "Globally-Visible Packages": https://guix.gnu.org/manual/devel/en/html_node/Using-the-Configuration-System.html
By using `specification->package' I can set the package name following
this format:
(use-modules (gnu packages))
(operating-system
;; ...
(packages (append (map specification->package
'("[email protected]"))
%base-packages)))
I had only read "11.3 operating-system Reference" until now.
Sorry for my noise.
Have a nice day.
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