I have found a work around.
You will set “Manual Proxy Configuration” to Katalon Studio. This will let “Reload plugins” operation to success. But your test case scripts will be unable to reach to the hosts on your intranet.
Now you can use Desired Capability to tell Chrome browser of proxy configuration. Chrome browser accepts --proxy-bypass-list option. You can specify the host name (ip address) of your target host on your intranet.
This worked for me.
Also it is possible to set the Desired Capabilities for browsers programatically.