What is the multipart/form-data counterpart to the following application/json?

```
{
    "html": {
        "headers": {
            "content-type": "text/html;profile=mediawiki.org/specs/html/1.0.0"
        },
        "body": "<html>The modified HTML</html>"
    },
    "original": {
        "revid": 12345,
        "wikitext": {
            "headers": {
                "content-type": "text/plain;profile=mediawiki.org/specs/wikitext/1.0.0"
            },
            "body": "the original wikitext"
        },
        "html": {
            "headers": {
                "content-type": "text/html;profile=mediawiki.org/specs/html/1.0.0"
            },
            "body": "the original HTML"
        },
        "data-parsoid": {
            "headers": {
                "content-type": "application/json;profile=mediawiki.org/specs/data-parsoid/0.0.1"
            },
            "body": {
                "ids": {}
            }
        }
    }
}
```


Should each multipart field contain JSON?  For example:

```--------------------------d0f6b49b1b041887
Content-Disposition: form-data; name="html"; filename="html"
Content-Type: application/json

{
    "headers": {
        "content-type": "text/html;profile=mediawiki.org/specs/html/1.0.0"
    },
    "body": "<html>The modified HTML</html>"
}

--------------------------d0f6b49b1b041887
Content-Disposition: form-data; name="original"; filename="original"
Content-Type: application/json

{
    "revid": 12345,
    "wikitext": {
        "headers": {
            "content-type": "text/plain;profile=mediawiki.org/specs/wikitext/1.0.0"
        },
        "body": "the original wikitext"
    },
    "html": {
        "headers": {
            "content-type": "text/html;profile=mediawiki.org/specs/html/1.0.0"
        },
        "body": "the original HTML"
    },
    "data-parsoid": {
        "headers": {
            "content-type": "application/json;profile=mediawiki.org/specs/data-parsoid/0.0.1"
        },
        "body": {
            "ids": {}
        }
    }
}

--------------------------d0f6b49b1b041887--
```