I’m sorry, but perhaps I wasn’t precise enough.
So far I created a rule for the agent with the paths (which show up in the config file on the host):
Setup>Agents>Windows, Linux, Solaris, AIX>Agent rules>Count, size and age of files
Then I created a file grouping pattern to collect those specific files in a group:
Setup>Services>Service monitoring rules>File grouping patterns
And that group is then placed in the rule to create the service to monitor all files with a name including NOTIMPORTED:
Setup>Services>Service monitoring rules>Size, age and count of file groups
On a host it also already showed up, but back then it was with the wrong services and now, on a rescan, it is just a vanished services. I checked that there are indeed files named NOTIMPORTED[…] on several of those paths.