All that information is stored in the MC database on your PC. If you export the database as an MPL file, it will make a text file for you that you can move over to the Mac.
If you look inside the MPL file you'll see that it has entries for every music file in your library, complete with play count and all of that. However, the paths to these files will be the paths on your PC, which aren't the same as your Mac.
You should be able to use a text editor to change those paths to be where they are on the Mac. You'll need to make sure to change backslashes into slashes in the paths too.
Once that is done, you should be able to import that into MC on the Mac. This will update the database entries with all of that information. Now, it gets a little strange here, as I have seen cases where you need to import the MPL file *twice* on the Mac in order to get everything. I'm not really sure exactly why, but I have seen that behavior.
I recommend making a library BACKUP on the Mac before you start. That way if things go sideways, you can always just restore the library backup and start from where you were. Specifically I mean: File > Library > Backup Library .
Thinking about it some more, you might do an experiment with ONE album. Highlight the album, export it as MPL, edit the MPL file, move it to the mac, and import it on the Mac. Then see if the play counts, etc have updated. (Again you might need to do the import twice).
Good luck!
Brian.