Challenge for NewGRF - does it possible at all?

[Tortortor]

Hi,

Let's see to the stations list:


Does it possible to change icons with amount of cargo and delivery rating next to station name by the numbers?
Like: 1100 bags or valuables, 45%.

10-24-2015 7-56-18 PM.png (7.61 KiB) Viewed 2273 times

Or it is possible only by patch?

[Eddi]

that can only be done by a patch.