curl --location --request DELETE 'https://demo.myshopify.com//admin/api//themes/.json'
{
"id": 752253240,
"name": "Sandbox",
"created_at": "2023-01-03T12:21:36-05:00",
"updated_at": "2023-01-03T12:21:36-05:00",
"role": "unpublished",
"theme_store_id": null,
"previewable": true,
"processing": false,
"admin_graphql_api_id": "gid://shopify/Theme/752253240"
}