Excel
A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
2,044 questions
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Can support for this be added if it doesn't exist already?
For now, it is not support to add notes to cells with Office Javascript API.
You can vote this https://techcommunity.microsoft.com/idea/microsoft365developerplatform/add-support-for-notes-to-office-js-api-for-excel/4017916, and it might be support in the future.
Regards,
Meekou