You should be able to do this with Homeyscript, I think. Take a look at this example:
You will of course have to modify it for your particular device. To find the exact names you need, look at the device in Developer Tools. In your case, the capability id you need is ‘meter_sum_month’.
Edit: I tested this myself, and it seems that this capability isn’t setable:
Failed to update value: HomeyAPIError: Capability Not Setable
