Silly me I thought KFV Warnow was a club name... 😆
I'm not in the macOS ecosystem, so do not know the ins and outs of the different programs. One of the advantages of FM Graphics Configurator is the possibility to use ID and additional text in the filenames and still create working configs automatically. If fm xml app for mac does not funtion similarly, then manually editing the xmls is probably the only way. Adding the directory path to the config if the config is not in the same folder as the images is something that should work fine. All the names of the folders and files must contain only English alphabets, so no umlauts or other diacritical marks - from the screenshots it looks like you have taken this into account.