How to properly identify JSON API field properties?

Okay these API works fine! Just struggling a bit to identify which type of JSON i should define, as it doesn’t automatically recognize it. I guess what I’m seeing an marked YELLOW here is a keyed array in json (key:value). How to get that into a chart?

https://www.w3schools.com/js/js_json_objects.asp (KEYED JSON ARRAYS)

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