Let user update a specific app

Let user update a specific app

Hi, I and my colleagues use on our android work table an app that is not available on the play store.
The app is able to update  itself to new version and when a new release is available, a notification is prompted to tell the user to click to update. But the mdm agent block me because user don't have sufficient permission to do it.
How can I grant the user the permission to update this specific app? Thanks
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