OWA now supports Office 365 Sensitivity Labels, which means that users can apply labels to mark and/or protect messages with encryption just like they can with Outlook. The update adds to the ways that sensitivity labels can be applied to Office 365 content, with the next step being to achieve the same support for the other online Office apps.
https://office365itpros.com/2019/10/04/owa-embraces-office-365-sensitivity-labels/
