Documentation no, but I did manage to figure it out.
The data will show up as dynamic content along the lines of "feature repeats attributes ...." and when you select this it will put it into an "Apply to Each" which is the Automate equivalent of a loop.
The struggle I had was when the apply to each is added the output it selects from the previous steps as default has an additional '[value]' tagged on which causes some issues with the way it handles an array. So after I put all of the content in the main action I changed that initial dynamic content piece to "triggerbody()?['feature']?['repeats']?['repeat_name'].
Not sure if any of what I wrote makes sense off the bat, but hopefully it helps a little. Automate definitely is not the most user friendly thing I'm finding, but I did manage to make it work!
