Golang：生成/解析XML和JSON的结构(Golang: structure to generate/parse both XML and JSON)

The use case is to generate (and parse) the following XML and JSON not creating separate structures for every of them.

XML

<xxx xmlns="http://example.org/ns">
    <data type="plaintext">Hello</data>

    <field1>Something1</field1>
    <field2>Something2</field2>
    ...
</xxx>

JSON

{
    "data": "Hello",
    "data_type": "plaintext",

    "field1": "Something1",
    "field2": "Something2"
    ...
}

Possible solution would be:

type Xxx struct {
    XMLName xml.Name `xml:"http://example.org/ns xxx" json:"-"`

    // **If only "inline" attribute had existed**
    Data    Data     `xml:"data" json:",inline"`

    // There are a lot of other fields here
    Field1  string   `xml:"field1" json:"field1"`
    Field2  string   `xml:"field2" json:"field2"`
    ...
}

type Data struct {
    Value string `xml:",chardata" json:"data"`
    Type  string `xml:"type,attr" data_type:"data"`
}

However, right now it produces the following JSON:

{"Data": {"data": "Hello", "type": "plaintext"}, "field1": "Something1", "field2": "Something2"}

which is not what I need. So, is there any other way to solve the problem not using separate structures for xml and json?