@Swahela Mulla,Thanks for posting in Q&A.
From your description, I know that you are looking for a method to monitor the percentage of endpoints that have encryption enabled.
Based on my testing, I found that you can check it in Intune. Location: Microsoft Intune admin center > Devices > Monitor > Encryption report.
In the page, you can see how many devices have enabled BitLocker. Also, you can export the report and the format of this report is excel. Then you can convert data in excel into percentage format through some operations.
Hope this can be helpful.
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