@StabbingQTip already done! 
Well, sort of. TrainerRoad already provide your power curve. All you need to do is pick data points from that curve and use some on line critical power calculator (type in the data from your power curve and click 'calculate). You should be able to find 3 point and 5 point CP calculators on line for free.
OR you can go the extra mile and construct your own model/calculator using a quick Pubmed search and a spreadsheet.