Thank you for this new solution. Unfortunately it still does not meet my needs. As mentioned before, here is exactly what I need as input to update my Google Sheets database:
(The domain name being my ID for updating my database.)
Because using the Merge method (Append mode) mentioned by @Jon, this is what I get as output from my last Merge node:
All the data generated upstream must be stored at the same level, in an array. Without it, I cannot update my database in Google Sheets.
I would need to run the Google Sheets node (which I had replaced with Slack to simulate the action, and see how many times it actually runs) ONCE with this strict same input:
Is there a way to do this via Javascript? Because I have the impression that I have done the rounds of all the n8n native nodes, which obviously do not meet my very specific use case.