Can I create a plugin framework in c++ that works like the CLR?

I am currently working on an art application in qt, and have been trying to find a good way to allow the creation of plugins for it. I really just need some way to have code work through a special interface in the program. So I've been pondering the possibility of having a small language that is compiled to intermediate language and JIT compiled at run time.

So to sum up:

• Does a library for doing something like this already exist?
• Would it be better to use some kind of interpreted code instead?