Prefer setopt to :custom from use-package

The following does not provide completion for variables:

  (use-package thing :custom (thing-thing :ok))

lisp/icejam-dashboard.el

@@ -14,15 +14,15 @@
   :commands dashboard-setup-startup-hook
   :hook
   ((elpaca-after-init . dashboard-open))
-  :custom
-  ((dashboard-footer-messages '("Happy coding!" "I showed you my source code, pls respond"))
-   (dashboard-startup-banner 'logo)
-   (dashboard-items '((recents  . 5)
-                      ;; (bookmarks . 5)
-                      ;; (agenda . 5)
-                      ;; (registers . 5)
-                      (projects . 5))))
-  :config (dashboard-setup-startup-hook))
+  :config
+  (setopt dashboard-footer-messages '("Happy coding!" "I showed you my source code, pls respond"))
+  (setopt dashboard-startup-banner 'logo)
+  (setopt dashboard-items '((recents  . 5)
+                           ;; (bookmarks . 5)
+                           ;; (agenda . 5)
+                           ;; (registers . 5)
+                           (projects . 5)))
+  (dashboard-setup-startup-hook))
 
 (provide 'icejam-dashboard)
 ;;; icejam-dashboard.el ends here