production boost

In all my cities that are producing buildings, districts or wonders I'm getting -1% towards my total production in that city. Because it only affects when I'm producing buildings, districts or wonders and not when I'm producing units I'm assuming it is related to Industrial city-states, more...

Is there any way to implement that, each unit kill grants a small production boost in every city, similar to the jfd franklin rooseveelt mod and the production or gold choice boost for each social policy? I need to learn how to implement that into the xml if possible please.