How to import JSON data into EXCEL columns?

I have an excel spreadsheet like following:

with a first column the name of something, and then two columns "date" and "owner". I also have the following JSON file which I want to import via "Get Data" -> "From File" -> "From JSON" to populate the empty columns automatically from the data in the JSON file.

JSON file content:

{"TEST-1": {"date": 2,"owner": "Alfred"    },"TEST-2": {"date": 4,"owner": "Berta"    },"TEST-3": {"date": 6,"owner": "Cesar"    },"TEST-42": {"date": 84,"owner": "Dave"    },}

in the end I want to have the excel table look like following:

But I have no clue on how to do this with this "Power Query".Any ideas? Tutorials? Simple explanations?