In Reaper
Options > Show REAPER resource path
copy ReaTrak Biab SGU MGU.. to regions.lua to the Scripts folder
or Scripts\ReaTrak

Actions > Show Action List > Load button browse to script file
choose ReaTrak Biab SGU MGU.. to regions.lua

select and Run button

remove .mp4 from file name and unzip
ReaTrak Biab SGU MGU.. to regions.zip.mp4

Also install https://sws-extension.org/ if you haven't.

Yes, one could be made to work with Studio One.

This simple:
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Then if you have ReaTrak installed you can use the Chord Sheet UI:

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