How to get a subset of fields from an API within anothe field

Hi, I am trying to limit the amount of data transferred back from the API.

I can get a subset of fields using fields=.. parameter in the query.

However, I want to limit also a set of fields returned within a nested structure. For example when I call

/dashboards I need to get dashboard id, title and folder id and name.

fields=id,title,space works fine, but I get all sub fields of a folder tag. How do I pass in something like folder.id,folder.name?

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