I haven’t had to do it in a while, but basically do the timewarp in timing, then copy the timing channel, paste that into the x channel in an axis in action. Then in action, in the object tab, shift-click the x value. Save the action and select raw on export. This will create a .raw file. Change the .raw file to a .txt file. Now when you open that up you should see two columns, one with the absolute frame number and one with the timewarp frame number.
Not exactly sure how CG applies the text file to the camera thereafter, I just know that it can be done.
Also here is an explanation of how to link the timewarp to the camera in flame.