I have tried for hours and found no solution for this problem.
There is a Pipe I'm designing that pulls data from different RSS feeds. URLs for these feeds are located in a CSV file, so I'm able to parametrize this Pipe in the future.
Everything works correctly, however when I try to add URL of the original feed into each post returned by the Fetch Feed loop, I am only ever able to add this into the first one. I'm adding this information as item.feed.feedUrl in the second loop.
I need a solution where I may be able to add this information into ALL posts, so I can later identify the source for them.
Any ideas?
Although I wasn't quite able to answer the question, I developed a solution that allowed me to return feed data along with original feed's URL for each first post.
To get an idea what I did, you are welcome to visit the final FeedMerge Pipe.