I guess the only limitation for 'complicated' chords would be space, so the font would have to be smaller?

This could be a memory-jogging guide for performance, much as iRealPro is used on an iPhone or iPad. You don't need the upper extensions if you know the song but just want a quick reference for what in general comes next.

Anyway, now that we know what this format is (thank you), this thread started with a request for BIAB to be able to print a chord sheet in this format. To that, assuming it's an added option,

+1


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.