A number of apps and online services have a feature in which, having filed an IFR flight plan using it, one receives confirmation of filing and, shortly before the ETD, an expected clearance from ATC which can be either loaded directly into the app flight plan or copied/pasted into the app. I think the service is actually by arrangement between the app/site and Leidos.
Does iFly do this? I haven't tried and can't tell one way or the other from the user manual.