Adding to a repeating section using the API

Hello, I'm writing an API script that I want to add some entries to a repeating section on a character sheet. From what I could gather from older topics it should definitely be possible, but it's not at all clear to me how I should go about it. Should it be done simply through createObj("attribute", {object} )? If so, what exactly is {object} supposed to look like to make roll20 know that it belongs in the repeating section?

Try the information at this link to see if it gets you where you need to be.

I see. That helps, thanks!