Need an easier way to access Bones inside a rig

[Mehdianim]

I am having a hard time access a bone. Say I want to use animation nodes to rotate a bone. The Object node allows me to select the rig object, but I can't find an easy way to access a specific bone inside of the rig object.
It would be very powerful way to retarget animations between rigs and use nodes to create offsets etc...
Something similar to the bone selector that appears when you apply a constraint using a rig object, it automatically asks you what bone in the rig you want to use.