How do I add values to xano object keys from weweb form

I have a multi step form, 8 pages, and thought maybe it would be best to put each page of the form into an object rather than a large amount of separate binds(please tell me if this isnt the best way to do it).

The issue I am having is I cant seem to fill all the key values. I can fill in the first, but I am not sure how to write the rest of the formula. Could someone help? Docs only show for a single key value

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I figured it out eventually. For those who may face the same issue
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but I have a follow up question.
whats is, if any, the benefit of doing this as an object rather than just binding separate keys and values?
The only benefit I see is a more tidy table, but, its a lot quicker to bind single keys than writing formulas.
are there other benefits?