In the Whats new Page for Intune (https://docs.microsoft.com/en-us/intune/whats-new), you can see that Microsoft recently added some BitLocker encryption reports in Preview.

For more information: https://docs.microsoft.com/en-us/intune/encryption-monitor

To access the Bitlocker reports, go to the Intune portal (portal.azure.com or devicemanagement.microsoft.com) and go to Device Configuration > Encyrption report (preview)

An example of the Bitlocker report is below:

You can also use the Filter button to filter the encryption readiness by Ready/Not ready and Encryption status by Encrypted/Not encrypted

The example below shows the devices that are not encrypted: