Hi @dp01110 ,
If want to display Excel SpreedSheet dynamiclly in SharePoint Online, just need to use Embed Web Part, no need to develop custom web part/feature to achieve:
Upload a file into SharePoint Library:
Open this Excel File in Excel and click File->Share->Embed:
Get Embed Code:
Add Embed Web Part in SharePoint Online Modern Page:
Embed code in the web part and publish the page:
This way can display the excel sheet data dynamically, after editing the data in Excel Online, the Embed Web Part will also refresh to the latest data.
Reference:
Embedding an Excel Spreadsheet in to a Modern SharePoint Page
Hope this can be helpful to you and get you the right direction.
Thanks
Best Regards
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