Try treating Specials as Season 00
Parks and Recreation (2009) - S00E01 - The Spider
That’s worked for me in the past. This is another place where the app FileBot helps. You could probably have a file named
Parks and Recreation - S00E01
and FileBot would look it up and name the file appropriately. This is especially awesome when you’re not sure on the naming as you can experiment with FileBot to get them ready for Plex rather than experimenting with them in Plex’s view. This helps me avoid the dreaded “Plex Dance” I dummied up an episode and here’s what FileBot did: