Because of support for non fixed width fonts, the app splits the chords and lines into table columns and trims each column. Additionally, the app does its best to maximise the space taken up by the lyrics, so tries to strip out what it sees as wasted space.
You can force an additional space by ensuring you have extra space(s) after the chord (if there is only one) and before the lyrics. This will add in an extra space, but will be restricted to one extra space, but giving you what you've asked for.
.e.g. (with all text highlighted to show spaces)
.G
The lyrics
If you do want more space, you can trick the app to make the song split the lyrics by adding a small . into the chord line
This will still display the . but it will allow more space at the start.