[Python] How to read delta table and get empty columns in df?

In my file I have :

{
"Car": {
"Model": null,
"Color": null,
}
}


I use read_delta to read the file:

df = df.read_delta(path)


At the end, I have an empty df. I want to get df with column car and value {"Model": null,"Color": null}

Thank you

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