I'm going to be a nerd and say "you've checked online for the info right"? Just sayin', sometimes the websites have more info then the menues. Now assuming that you have looked diligently and the restaurant is just being obtuse, you can always just kinda ball park it, since you have the total calories for the dish you can divide the total calories by 3 then use this handy-dandy table;
Protein 4 calories/g
Fat 9 calories/g
Carbohydrate 4 calories/gSo, say it's a 300 calorie meal, that's 100 calories in each section which works out to about 25g each of Protein and Carbs (100/4=25) and just over 11g of Fat (100/9=11).
Now keep in mind this is just an estimate so if you're keeping track of your PCF percentages then this may throw them off, but at least you'll have values for the required fields.
Hope this helps, if not, feel free to message me and rant about how I just wasted your time