No. Dictionaries only save text/numbers. You will have to do a string substituion here. An extra expression was added just recently to easily do this! It's in the recent beta release.
Value stored in Dictionary: "Press {0} to jump"
StringSub(Dictionary.Get("tutorialJump"), "J")
Result: "Press J to jump"
You can replace J with whatever expression you like. You can also add as many substitutions as you need like
"Press {0}, {1}, {2}, {3} to move"
StringSub(Dictionary.Get("tutorialMove"), "W", "S", "A", "D")
Result: "Press W, S, A, D to move"