For the transformations where you just want to take the value directly - like in this case where the value of the common term should be the same for your application, you can just do a: 

<OUTPUT>: <INPUT PATH>

so for example:

                    "access_commonprefs_punctuation": "display.screenReader.-provisional-punctuationVerbosity",

should produce the same result as below (changed "language" in the example to                     "access_commonprefs_punctuation": "display.screenReader.-provisional-punctuationVerbosity")