On the top right side of chord-o-mat you find a dropdown menu, which lists all files cantained in the folder. This path is stored inside chord-o-mat and the file will be recalled, if you load your live set.
don't forget to save your changes
While all the settngs are stored insde the *.json file don't forget to save the file after every change you make inside chord-o-mat.
Please remind, the changes will not be saved within the Liveset, only the path to locate the file.