How to aggregate data by JSON field to build Stacked Chart of values per each field name?

[Murz]

I have log report in JSON format, containing statistics like this:

{
        "import": {
          "imported": 96,
          "unchanged": 8,
          "ignored": 88
        },
}

How can I aggregate those values to build stacked chart, without describing each value in separate query?
Here is example if same data, collected via prometheus:

import{status="imported"} 96
import{status="unchanged"} 8
import{status="ignored"} 88

that can be easily visualized in stacked chart via simple query by label, like this:

Can anybody give me example, how can I gain same chart from Loki record in JSON format?