Get value of array name

I am trying to make a CSV file with not only headers but a first column with names of values.
What I need is to get a “name” of an array while iterating. I was trying to use one of older tutorial found here on community but with no success. I dont know what I am doing wrong. Any idea how Can I iterate through array names in the collection ?

Zrzut ekranu 2024-01-24 o 18.21.59

You can use the built-in function toArray

e.g.: in a Set Variable module,

{{ toArray(first(test)) }}

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It took my some time to understand what is happening with the array which contained 3 more arrays. I was thinking that after iteration I will get one of these arrays, but it turned out I had to pick one (first) anyways. Thanks