I am not sure offhand, but when I get stuck with something like this, I use the Debugger in Workspace so that I can see how the API is written there...
Under the Help Menu, enable "Debugger"
This will add a little bug icon to you tables:
![Jennifer_Dungan_0-1719324458010.png Jennifer_Dungan_0-1719324458010.png](https://experienceleaguecommunities.adobe.com/t5/image/serverpage/image-id/76110iBC410B83CC5C9754/image-size/medium?v=v2&px=400)
If you click on that, it will bring up a submenu for Freeform Table or Sparkline:
![Jennifer_Dungan_1-1719324507044.png Jennifer_Dungan_1-1719324507044.png](https://experienceleaguecommunities.adobe.com/t5/image/serverpage/image-id/76111i12B46394BA794AEC/image-size/medium?v=v2&px=400)
Expand the Freeform Table to see one or more timestamps:
![Jennifer_Dungan_2-1719324553526.png Jennifer_Dungan_2-1719324553526.png](https://experienceleaguecommunities.adobe.com/t5/image/serverpage/image-id/76112iA155F7B698B1C61D/image-size/medium?v=v2&px=400)
Clicking on these will take you to a page that shows you the API query that was used in various formats.
If you build out a simple freeform with the dimensions and metrics you are looking for, you should be able to find their identifiers.