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Nested Fields Usage #74
That's the part I didn't understand: that they can only be used with the json location.
As a side note, nesting of fields in query params and form params could be possible with a delimiter, such as when querying in MongoDB.
Would this interest you? Or do you think that is assuming too much, as it does reserve a character in webarg names that would otherwise be acceptable.
You could, however, implement a parser that could read nested query parameters, though I do not think this functionality belongs in webargs. I know that filteralchemy (which uses webargs internally) has the concept of custom formatters for query params: https://filteralchemy.readthedocs.org/en/latest/quickstart.html#customizing-query-format .