How to get the input waypoints time stamps after calculating trajectory?

In my case, I need to generate a trajectory including 27 intermediate waypoints, and I want to set robot I/O to trigger camera on every intermediate waypoints.

But I could only get the sampled waypoints time stamps by

trajectory.times

which is not the input waypoints time stamps during the trajectory.

Is it possible to develop a property of "trajectory" to output the input waypoints time stamps?
Thanks a lot.