[plt-scheme] How to replace a Unicode string in the definitions with the result of evaluating it?

> The two notations for the strings produce identical strings (just ones
> that are written differently), so you don't need to evaluate anything,
> just use read & write (or if you don't want the quotes, read and
> display).

I see.

The use case I am trying to satisfy is the one where I write something like:

(define (play-"\u266C" notes)
  ; work goes here
  #t)

I am trying to find how easy it is use use Unicode symbols directly in the code.