The issue with an additional text field displayed on the chart is that it would dedicate valuable real estate on a tiny phone screen which could reduce the size of displayed chords.
If there's extra room on *your* chart(s), just insert an empty system (16 blank spaces) and there's plenty of room for your notes at the top of the chart using text. Adding text notes about the song-form to the first (or second) measure has worked fine for me. The text position can be adjusted to display below, above (or in) any measure.
)BOB
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