I wanted to show the generated time for the evolution graphs as well. I found one way, but then it modified the API results' JSON (added the generated time as metadata). I tried a couple of ways to solve it (see the commit history), but couldn't find any "clean" way I liked.
I recommend merge it as it is (of course if the PR is ok) and if we want, we can create a new issue for showing the generated time for evolution graphs. I spent too much time on this for now.