You can convert the plist file into other format such as csv, each line represents a single pologon, and write a simple reader for that format.
0.000, 40.000, 0.000, 0.000, 256.000, ~~2.000, 256.000,~~2.000, 255.000, 33.000 /*** The 1st pologon*/
20.000, 80.000, 20.000, 20.000, 266.000, –5.000, 265.000, 67.000 /*** The 2nd pologon*/
If you can’t change the plist configuration tool, you can convert the plist format to csv(or other formats you like) by adding a RunScript build phase in Xcode.
I think a simple python or bash script could handle it. (I recommend python plistlib)