A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Cadutch,
For real-time updating, you can keep the Excel file with the pivot chart, remove the gridline in it to make it look like a PDF file by clicking on View>uncheck Gridlines, upload the file to a site library, create a new page>insert the File Viewer web part, click on Edit web part>make the web part only show the pivot chart in the Excel file>save the page and now the page and the chart look like the following.
Now you can go to the site library>open the Excel file in the Excel application to update the source data and the pivot table and then the page will be updated as well after you refresh the site page.
Best Regards,
Cliff