There's a Cockos script Scripts\Cockos\lyrics.lua
I know I always ask too hard stuff but I'm just looking at modifying lyrics.lua to work as a chord/region viewer.
It will have 4 measures across and each beat of that measure can be edited with a chord name that will edit
or insert that region and display that region's color.
It needs to work like the gif under.
I don't mind making a donation if someone would like to help out.
This is to be added to ReaTrak
https://forum.cockos.com/showthread.php?t=212645
The Editing mode in lyrics.lua lets you edit each beat so you can edit each beat of each measure and that will edit or inset the region/chord name, the measures will be the region color and the current playing measure will be highlighted, it will need bigger fonts maybe use the existing drop downs for font and size so you can use a music chord style font (see bottom pics):