What is easy/suitable? 
There are several options
- integrated ChordPro viewer which also supports PDF
- the great Lyrics/Chord extension
- Michels approch to integrate cheat sheets into the rackspace directly
- use a companion app like Onsong, Bandhelper, MobileSheets, …
Personally, I still use Bandhelper, as I can run it independently from GP on my tablet or any device with internet access to prepare Setlists, import lyrics/chords from different sources etc.
For some songs I added some additional information in ChordPro sheets for the Lyrics/Chord extension.
Comment/addition to @Michelkeijzers script: I think I would place all the information in external files and load them by LoadStringFromTextFile() with the filename derived from the rackspace or songname and include all the needed scripting more general with Include "xyz" in my scripts - personal taste