Question: Is there a way to configure watchPattern in triggers.json to recursively check for any new jpg in any subfolders under C:\ftp?
Assuming you've mounted the ftp folder to /aiinput in Docker then something like this will probably work for the watch pattern:
/aiinput/overview/OverviewPTZ/**/*.jpg
. The watchPattern supports globs, but I've never tried with it so you may have to play around with it a bit.