The exported CSV contains per day values for: Average Viewers, Follows, Minutes Streamed, Minutes Watched, Live Views, Max Viewers, Unique Views, Hosts and Raids Viewers (%), Chatters, Chat Messages, Clips Created, Clip Views.
There’s no way to get over-time data for past streams through the API. All you would know is that a VoD exists, how many views it currently has, etc… There’s no way for you to know chat activity, viewership over time, or anything like that unless you captured that data every minute for example as that stream happened.