Show intervals or note names instead of fret number / open string notes

[Aeyk]

In the README the very last example (the 4-string ukulele playing x232) shows note names inside the fret circle, is there a configuration option somewhere to enable this? Alternatively, is there a way to show the notes of the chord in place of the notes of the open strings? From the example it would show E A D F# instead of E A D G below the chord box.

Example linked below https://camo.githubusercontent.com/c69250fa7680de446c47a15f3127c24cdaeab82db7818f245f5187863acb48ac/68747470733a2f2f696d6775722e636f6d2f47713946706e552e706e67