How to switch InstancedFoliage to recieve GI from Volumetric Lightmap?

Hi there, UE4 people!
I have a static mesh tree in project browser.
When i drag it to InstancedFoliage type slot, i can use foliage brush to put a bunch of trees in my level, ok.
But how i can switch them to recieve GI lighting from Volumetric Lightmap? There is no dropdow list, where we can switch this as usual.
Or maybe i can switch this in static mesh editor?
Please help, i cant find the solution.

Thank you in advance.