Window window tricks such as @eax are called [Psuedovariables]. In fact, they are documented. I wrote a blog post about this and some other VS debugging devices a few years ago. Format specifiers are usually very useful.
For your specific question, there is no psuedo variable for eax in managed code. However, there is a register window in which there are actually EAX and other registers. It is highly doubtful that this will be useful in many situations, since I do not believe that there is a way to pass an address to a managed type. However, you can see the layout in the memory window
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