Appending data to previous step (or bringing previous data forward)

Functional question about n8n, when for example, I have a text transcription that I want to summarize and return data to, what is the best way to bring the previous items data forward, and append the summary to the text.

I usually want to append data into the previous steps data, and is it best to do a continual merge, or code function to add it? Does anyone have a posted example of how to keep building additional data, or how to keep the previous steps data, and add to it when processing a new step?

This becomes more important when a step mail fail or not return data.

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