As @pedro said you could add user defined fields. Here a description of how:
Example: (capacitor symbol with the fields required to look equal to the one you show on the right.)
c_fields.lib (514 Bytes)
To edit (and add) fields to symbols press the "T" button in the symbol editor.
Make sure you give your personal symbols a unique name or move your personal libs to the top of the component library dialog. (Increase the priority)
You could also do this in eeschema. Simply press e on top of the symbol and add the fields to the one symbol you are currently editing. (This will also be how you set the values if you have already added the fields to the symbol via the symbol editor.)