Reference index of repeater when textarea updates

I have a listview repeater with a textarea component. The data is based on an array of strings from a document in mongodb. When i change the text (and use shift+enter) i want to update only that item in the array in the db. Can I either use the "Run Script" on the Change event and use a "this" or "item" reference to get the updated value and the index of the item in the repeater, or trigger a query and get this info in the query. I also looked to loop through all of the listview child components, but didn't see an easy way.

Thanks!

@Ryan_Wheeler did you end up finding a way forward on this? If so, sharing any advice or solution back here could help others running into something similar! If not, consider dropping by one of our Office Hours to chat in more detail about approaches to this use case?