Oh now I understand your issue.
You are using an external format, in .JSON files and want to parse it in Construct to make your own engine using those files as data.
You can see how you can use the "For each entry" condition in the JSON example in the start page of Construct.
As you can notice, your "sectionNotes" array is at the same level as the "authors" array in the example.
You can indeed check paths that will give something like
notes.sectionNotes.X in your case (X being 0, 1, 2...)
The issue is perhaps not with JSON, but with your time elapsed comparison.
I assume for notes.sectionNotes.1 that you compare your time variable to be equal 600, when it would be more accurate to check if it is equal or greater than.
This is only an assumption though, consider posting your actual project for us to be able to see what might be going wrong in your implementation.