Are you sure you can export to P2 ( a camera format) ?
Of course, we've been mastering to the P2 format for years. It's system agnostic. We used to master to a prores file.
We do not currently support Smart Rendering for P2 export, so there will be recompression involved.
We do support Smart Rendering for some codecs in MXF OP1a (there will be a "Enable Smart Rendering codec" checkbox enabled under Video tab of Export Settings) and QuickTime (e.g.: ProRes, but no checkbox in Export Settings, it just happens automatically). More info on Smart Rendering can be found at:
Hope this helps.