curl --location --request PUT 'https://demo.myshopify.com//admin/api//blogs//metafields/.json'
{
"metafield": {
"value": "a translated blog title",
"owner_id": 241253187,
"namespace": "translation",
"key": "title_fr",
"id": 534526895,
"description": "Blog French title translation",
"created_at": "2023-01-03T12:21:36-05:00",
"updated_at": "2023-01-03T12:53:17-05:00",
"owner_resource": "blog",
"type": "single_line_text_field",
"admin_graphql_api_id": "gid://shopify/Metafield/534526895"
}
}