Officially exclusions from protection against external encryption are written on this page https://support.kaspersky.com/KSVLA/5.2/en-US/175626.htm

Starting from 07/06/2022 it is possible to add exclusions from protection against external encryption using "Exclusions" tab under "Exclusions and trusted applications" settings. 

Steps: 

• Go to "Exclusions and trusted applications" settings and move to "Exclusions" tab
• Add folder/filename (masks are supported) specifying SystemWatcher application component.
• Apply the policy 

The tested exclusions: 

<Drive>:\<Folder>\

<Drive>:\<Folder>\*.enc

<Drive>:\<Folder>\*\*.enc

Example: