Pls decode your json to array with like this:

$arrData = json_decode($jsonString, true);

Then use $arrData with an ArrayDataSource:

https://www.koolreport.com/docs/datasources/arraydatasource/

Pipe the data to a datastore in report setup and use a chart to display the datastore in report view. Rgds,

Describe your case more specifically with code/pseudo code, data structure, screenshot if possible if you want more detail help.