Yes, I did read the AIP before. Also sent the email to Afghanistan CAA, but no reply. That's why I come to ask if anyone ever have experience here.
The only thing I found almost related to my question in the AIP is here below.
Deviation from Airways
3.1 ACFT deviating from the low and high airways without ATC clearance will enter Class G airspace and may infringe military restricted areas and/or ACMs. ACFT who deviate from airways without clearance may be subjected to fighter interception, ICAO sanctions, and denial of future over-flights.
However, it didn't answer my question correctly. I mean what kind of clearance we will get from the Kabul controller if we are permitted to deviate more than 10NM from the route to be in the uncontrolled airspace. I want more practical information but anyway thanks so much for your reply!