Not sure since when it has been added but if you have installed the Azure mobile application (Android https://play.google.com/store/apps/details?id=com.microsoft.azure&hl=en or iOS https://apps.apple.com/us/app/microsoft-azure/id1219013620) you can now start and use Azure Cloud Shell (also available using a web browser at https://shell.azure.com/)
To start using Cloud Shell from your Azure mobile app, just hit the Cloud Shell button available (screenshot from Android, may differ in iOS)
This then connect and launch to Cloud Shell from where you can now run Azure commands (using PowerShell or Ba) or even Exchange Online commands (see https://t.co/6UpLPJbDFM)