There is a certain timeline graph that I cannot create in Power BI
Do you know if I can add it in my Power BI report directly from excel?
Only if you add it in as an image. It would not be interactive. If you know R, you can create that chart in R-script as a visual tile. Hope this helps.
Maybe you can try to use import feature to import data from excel workbook.
Import Excel workbooks into Power BI Desktop
BTW, current power bi not fully support excel contents and graphs, you can also submit this requirement to ideas forum.
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