Here's a video on extracting chords from audio
using Sonic Visualiser with Chordino vamp plugin Win/Mac/Lin and importing chords to Reaper.
Here's some updated scripts if you use txt export/import,
as txt uses tab as separator and and csv uses a comma.
right click Save Link/Target As
ReaTrak chordino chords txt to regions.lua
ReaTrak chordino chords csv txt to regions.lua
Sonic Visualiser File > Export Annotation Layer
https://www.sonicvisualiser.org/
Chordino Vamp Plugin
http://www.isophonics.net/nnls-chroma
https://youtu.be/PorPuqkpO_w