How can I get field-level validation errors in GraphQL mutation responses?

[andygrn]

When attempting a GraphQL mutation with invalid input data, model validation errors are being returned as a single concatenated string. I've got a front end form and it would be great to show errors in the page per-field, but I can't see a sensible way to extract that information from the return data. Is there a way to get more granular error reporting out of a mutation response?