[
    {
        "clientId": "_clientId_0",
        "name": "core/subhead",
        "isValid": true,
        "attributes": {
            "content": "This is a <em>subhead</em>."
        },
        "innerBlocks": [],
        "originalContent": "<p class=\"wp-block-subhead\">This is a <em>subhead</em>.</p>"
    }
]