Im pretty sure there is no such thing currently in the NSS. But with a little bit of scripting knowledge there are workarounds to get the desired outcome.
You can use Rest API call /activities which can be used with odata query and return latest errors on some regular basis, maybe every 30min, and then send an email if it recognizes import failed status. In theory you should be able to pull out the admin email address from the NSS as well.
Thank you for replying to the query. I did think there was not a alert that was already there and could be used, as saw nothing that could work.
Rest API's does seem the way to go, just did not enter my head.
Cheers, will have a look in to that.