Hi, it might be a totally obvious question, or some odd-ball request, but - is there any way to nest stacks?

I'm porting a site to concrete5 and trying to replicate the existing setup as closely as I can to reduce the pain for the site editors. Part of their fancy design means combining html + content blocks to get the right design (e.g. content wrapped by a fancy border).

I know I can do this via a stack that they can then drop wherever they want. What if I also want to combine 2 or more of these together into another stack - say for a standard left column. Is this possible natively or via an add-on?