Guys, I found out today that it is possible to enable the sandbox to "Network Service" in the latest stable version of Edge when the policy reports that it would be available from version 102:

https://docs.microsoft.com/en-us/deployedge/microsoft-edge-policies#networkservicesandboxenabled

To check:

Edge://sandbox

To enter the registry key:

HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Edge

 

You can also do the same in other Chrome-based browsers.
Obviously by not modifying registry keys.
And by sandboxing other services as well.