Get the tracks items insert times? (+ observation about state of api)

Hello,

I did not use the API in a long time, feel like I forgot everything. I have to say that the API doc is crazily scarce, I googled and doung the "CEP" stuff , but kept telling myself I think there is another missing file for premiere pro, till this day I am not sure where it is exaclty, I just know i landed on it again by chance here: (https://github.com/Adobe-CEP/Samples/blob/master/PProPanel/jsx/PPRO/Premiere.jsx)

It is well hidden!

Anyway I also googled this one: https://ppro-scripting.docsforadobe.dev/item/projectitem/, only to discover that 1) it is not an official guide (yet adobe refers to it sometimes here), and 2) it changed aesthetics (it used to be like this one: https://extendscript.docsforadobe.dev/file-system-access/index.html, with long list on the left).

Back to the question, can you tell me how to get the "insert times" of each item on a given track time please?

I have old code where I took an item then choose where to insert it. 

But what about the opposite? Meaning I will take an item from the track (including all cut clip, for example a clip from one file I cut into 3 parts), and then get the info about their starting times? (all of them within one track if possible)

I need this.
Thanks.