%f item in getqflist()

I am looking into parsing a list of strings with an errorformat to
create a quicklist or location list out of it. Currently, I am doing it
as follows:

let efm = "%f:%l:%m"
let what = getqflist({"lines": ["foo:3:bar"], "efm": efm})
call setloclist(0, what.items)
echo what.items[0]

This sets the quickfix list as expected (is there a better way?). But
when I look at `what.items[0]`, I cannot find an item corresponding to
%f (`foo` in the example). Yet setloclist() sets it. Where is that
information stored?

Thanks,
Life.

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