Worth remembering Tumblr had the reblog graphs before! They used to also indicate the usernames on each of the reblog points when selected, and were active as an option from 2016 to the 2020 recoding of the dashboard.
The current version is supposed to get the usernames back "soon" but it's been "soon" for nearly a year now, so it's unclear when that'll happen.
Worth remembering Tumblr had the reblog graphs before! They used to also indicate the usernames on each of the reblog points when selected, and were active as an option from 2016 to the 2020 recoding of the dashboard.
The current version is supposed to get the usernames back "soon" but it's been "soon" for nearly a year now, so it's unclear when that'll happen.