JSONName

struct Product {

    string name;
    float price;

    @JSONExclude {
        float weight;
        string weightUnit;
    }

}

auto json = JSONParser(q{
    {
        "name": "foo",
        "price": 123,
        "weight": "500g"
    }
});

auto product = json.getStruct!Product((ref Product obj, wstring key) {

    import std.uni : isAlpha;
    import std.algorithm : countUntil;

    if (key == "weight") {

        const value = json.getString;
        const splitIndex = value.countUntil!isAlpha;

        // Extract the unit
        obj.weight = value[0..splitIndex].to!float;
        obj.weightUnit = value[splitIndex..$].to!string;
    }

});

assert(product.name == "foo");
assert(product.price == 123);
assert(product.weight == 500f);
assert(product.weightUnit == "g");