By standing on the shoulder of the giant, I managed to display the real world quarterly result data (which loaded from a JSON file) as combo chart and tabular format using the charts_flutter package and the DataTable widget without too much hassle.
A picture is worth a thousand words:-
If you are interested to reuse the source code of the screen, please check out the chart_data_table branch of the git repository hosted at https://github.com/limcheekin/fluwix. Feel free to fork the repository and send me pull request.
I'd love to hear from you! :)