Not only available in Excel, but also in both Power BI and other Office products, Sensitivity labels from the Microsoft Information Protection framework are already available, allowing you to classify and protect your organisation's data whilst making sure productivity and collaboration are unhindered.
These labels will persist when applied from Power BI content and exported to Excel, PowerPoint and / or PDF files. However, this feature will shortly take a step further. When you connect to a Power BI dataset from Excel, that dataset's Sensitivity label will be inherited and applied to the Excel file and all associated outcomes, such as headers, footers and encryption.
This new, more rigorous integration between Excel and Power BI will provide users with more information protection in Excel’s familiar and easy to use interface, all with fewer clicks.
This update will start rolling out to Office Insiders later this year.