Different shadow strength areas / zones

My question is, if it is possible to have one directional light, and have zones where the shadow strength is higher. And be able to have diferrent shadow strength areas to be seen on screen at once. For example outside areas have brighter, interior areas have darker shadows.

I know that i can modify the light strengths on the fly, as i enter a new area. But that is not solving the issue. I want to be able to have different shadow strength areas on screen at the same moment. Somethinh like a fake GI, AO solution.

Is this possible, and if yes, it would be great if somebody could give a few hints how.

 

You cant do that, that would require a volumetric lighting solution...