Hi there, charts in a report are based on the data in the report's details tab. It's optional to have a chart in a report, and it's your report groupings that drive what's possible to put on an axis in a report chart. You can't have projects and issues/requests together in a report, they are separate report types (though some fields from both can be filtered in a report) so therefore you won't be able to pull them into 1 report's chart.
More on charts here: https://experienceleague.adobe.com/docs/workfront/using/reporting/reports/create-manage-reports/add-...
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