As far as I know, you can't do that. But you can avoid interrupting the list, by indenting everything that belongs to the item 4 spaces (that means code in there is indented 8 spaces!):
some more content related to item #1.
neat code for the second item
clarification about the code for #2.
the most important item
This item is so important, that it contains
- its own sublist
- with random
a boring item, to demonstrate that even after a sublist the original list can continue.