Support for SumEncoding ObjectWithSingleField ?

[Boscop]

Is it possible to decode sum types in such a way that there is no tag field, no content field, to be able to parse sum types from json that are coming from a Rust server using encoding (with default serde settings*)?

Here is an example:

    print(PossibleValues::NumberValue(NumberValueRecord { a: 123, b: 42 }));
    print(PossibleValues::StringValue(StringValueRecord { a: 123, b: "asd".to_string() }));
    print(PossibleValues::Empty);

serialized = {"NumberValue":{"a":123,"b":42}}
serialized = {"StringValue":{"a":123,"b":"asd"}}
serialized = "Empty"

There is no tag or content field. I think I need ObjectWithSingleField but nullary constructors shouldn't be { "foo": [] } but "foo" (flattenContentsArray = true), is that combination possible in PureScript waterslide with automatic/generic deserialization?

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*The API can't be changed anymore on the server-side because many apps and services already depend on it.