sorry can you show the entire flow and what you are trying to do here?
You have an array of items, you are iterating it and then a text aggregator groups it in a text string → this one is set to group by owners and you want the text only for a specific owner?
You are correct that the Text Aggregator does not output a bundle index or total number of bundles. This is because it currently outputs a single variable, and is probably an oversight. I’m sure others will agree that having the bundle index or total number of bundles would be nice to have too!
If this is important to you, please submit this suggestion to the Idea exchange, under App Improvement Ideas. However, do search for a similar request first (and also upvote), just in case it has already been suggested to avoid duplicates.
As a workaround, you can use an Array Aggregator module to aggregate the bundles from the Text Aggregator, then use the built-in function: