Anyone know if it is possible to return a comment in a function and have it compile it into the CSS?

@function em($target, $context: $base-font-size)
  @if $target == 0
    @return 0
  @return $target / $context + 0em /* #{$target} / #{$context} */

Used like this

$base-font-size: 16px 
selector
  font-size: em(20px)

Ideally that would compile to this

.selector {
  font-size: 1.25em; /*  20px / 16px  */
}

I use compass and have tried /*! comment here */ but that only seems to work at the top of the document. This is just like a nice to have. Once a project leaves my desk the CSS is typically used and my sass is tossed. Crazy to me but whatever.