In Denmark when flying in G og E airspace and being in contact with FIS, I sometimes get informations on unidentified aircrafts.
The phrases would often be like
"O-XX I have unidentified VFR-traffic at your 10-o'clock 3 miles out, unconfirmed altitude xxxx feet".
I don't think our FIS is required to issue such informations, but if they got the "dot on the screen" and the time to tell me about it - I surely appreciate it.