Yes, you left-click on the zone (on the blue dots). You can select the zone with left click on the map or on the field. This zone will appear in blue color in right side bar. Left click on the blue dots, the color of the dots will change from blue to red, and shelling will start after some minutes.
To cancel the shelling, left click on the red dots, they will change to blue. Shelling is halted almost immediately.
Thanks, I managed to call this artillery. Let’s go for quick battles.