Fetch data from the site and display it in a datagrid in a desktop program . I need someone who is an expert in javascript -- 2

There is a site where I check reports
I want to see this report in the desktop program
The data is fetched from the server and displayed in the data grid.
i don't have api
I was able to get the data from the site, but it needs to be fixed.
I need help to display the data correctly
I want to write a code using C#
Finally, I want the sours code
Sorry for the bad language, I use Google to translate