How to set max chunk count in destructible mesh?

I know UDK allows to set max chunk count(ApexDestructionMaxChunkIslandCount, ApexDestructionMaxShapeCount), which have removed unnecessary chunks(for example ApexDestructionMaxChunkIslandCount=400, ApexDestructionMaxShapeCount=400) But I don’t know how to set it in ue 4.24.3(blueprints). Thank you for the help!