Sorry for the late reply.
I think that you can just load two carousel components.
loadrt carousel names=left, right
for example.
Then you can enable the relevant carousel inside whatever handler script / subroutine you are using. Presumably based on the tool number?
I guess you will need some logic, if only to work out where to move the spindle to pick up the correct tool.
Handling a random toolchanger, where the tool can swap between carousels would be rather more of a challenge.