Create Data Type from JSON failing on uuid key

I have a JSON response which has a UUID key and an array of db entries as values. Trying to create a custom data type to make my life easier and get the error "UUID_VALUE: First character can't be a number.

1: it's a string, not a number
2: definitely valid JSON

Example data

{
    "68aa18be-aed3-4bc3-bd43-eb9a2c96b23d": [
        {
            "id": "f4e764ae-923a-4c4e-98e2-e7e743d088f6",
            "logGroupId": "68aa18be-aed3-4bc3-bd43-eb9a2c96b23d",
            "name": "Check Oil Level",
            "type": "CHECK",
            "stepInstructions": "Check the oil level.",
            "stepNumber": 1,
            "visualURL": null,
            "textInput": null,
            "checkResult": null,
            "note": null,
            "status": "PENDING",
            "createdAt": "2024-07-19T18:12:14.110Z",
            "updatedAt": "2024-07-19T18:12:14.110Z",
            "userId": "1af2161a-55cd-4504-8e38-f7aa3376db6c",
            "assetId": "5ee3a6d2-fc9c-4862-aa51-6eb90c481f45",
            "inspectionRoutineId": "3113fe38-2761-4a26-b83e-bdd66da54097"
        },
        {
            "id": "9d3098c4-7896-4ddf-85fe-0f8fbfd1db93",
            "logGroupId": "68aa18be-aed3-4bc3-bd43-eb9a2c96b23d",
            "name": "Drivers Side Photo",
            "type": "PHOTO",
            "stepInstructions": "Take a picture of the drivers side of the vehicle",
            "stepNumber": 2,
            "visualURL": null,
            "textInput": null,
            "checkResult": null,
            "note": null,
            "status": "PENDING",
            "createdAt": "2024-07-19T18:12:14.110Z",
            "updatedAt": "2024-07-19T18:12:14.110Z",
            "userId": "1af2161a-55cd-4504-8e38-f7aa3376db6c",
            "assetId": "5ee3a6d2-fc9c-4862-aa51-6eb90c481f45",
            "inspectionRoutineId": "c2e053b0-43a7-4d69-8b85-51ffaec4eff8"
        },
        // more stuff
    ]
// next uuid->records...
}