foo.clj

(let [foo-map {:foo #{1 2 3} :bar #{5 6}}]
  (transform [ALL]
    (fn [[report rows]]
      [report
       (transform [ALL]
         (fn [r]
           (if (-> foo-map report (get r))
             (str r)
             (inc r)))
         rows)])
    {:foo [1 2 4 5]
     :bar [2 3 5 6]}))
;; => {:foo ["1" "2" 5 6], :bar [3 4 "5" "6"]}