This is not to migrate notation-related contents to Cubase, considering that the notation system of these two softwares are totally different.
However, the exported .cpr file consists of all rendered dry audio tracks (per each instrument) and their VST (Audio) FX inserts, EQs, and the entire mixing console context. Plus, the MIDI tracks of all instruments.
By exporting such .cpr file, we can use “import tracks” in Cubase.