Processor help

I'm trying to figure out what is doable with processors, I have a beanstalke structure, I want to

generate moss carpet on top of any exposed bambo blocks
generate a variety of plants ontop of some exposed moss blocks
generate glowberries below some exposed blocks

I'm not sure If this is a proceessor list thing. I've also heard you might be able to do some of this kind of thing with features? not sure I've only used features with biomes never structures.