Trying to extract data from a replay

Hello there, I am trying to use this tools to export some data from my game replays, like hero damage per hero . For example I am looking for dataset like

Hero damage source | Hero damage destination | Damage Type | Level | Amount | TimeStamp
Muradin | Nazebo | Auto Attack | 1 | 100 | 10:56:12:10
Muradin | Nazebo | Auto Attack | 1 | 100 | 10:56:12:50
Nazebo | Muradin | Spell Damage {Frog hit} | 2 | 200 | 10:56:13:10
Nazebo | Muradin | Spell Damage {Frog hit} | 2 | 200 | 10:56:14:10
...

This for every hero to every hero per level in the match

I have exported the gamevetns.json but I cant figure how this file is structured. I mean its json but what does it actually mean? is there a documentation?