How to work with data from sheets module

By fetching data from a google sheets file with the “search rows (advanced)” module the modules output is just a single bundle with plenty (over 300) of items.

Each item represents a column and its related field value.

Now unluckily I couldn’t handle these results, since it seems like there is missing a collection or array hirarchy somehow.

I find no starting point to let for example an iterator pass the items.

and additionally to that very basic problem to catch the data just to handle it in the up following modules scenario, I would need the displayed columns identifiers like

A,B,C,D…AA,AB,AC

to handle them as related values. How could this be realized?

Thanks for any help in advance