Hi,

if anyone else runs into this before the core-updates merge happens, reasonably
simple solution without installing packages into other profiles (or system-wide)
seems to be to add following into services in home definition:

;; TODO: https://issues.guix.gnu.org/57498, should not be necessary after
;;       core-updates merge
(simple-service 'guix-home-bash-completion home-bash-service-type
		(home-bash-extension
		 (bashrc (list (plain-file "load-guix-home-bash-completion" "
for f in ~/.guix-home/profile/etc/bash_completion.d/* ~/.guix-home/profile/share/bash-completion/completions/*; do
[ -r \"$f\" ] && . \"$f\"
done")))))

Leaving it here since it might be useful to someone.

W.

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.