That isn’t part of the Markdown specification, and I don’t see lists in the MultiMarkdown definition so it must be inheriting it verbatim from Markdown as it is a super set.
- https://daringfireball.net/projects/markdown/syntax#list
- https://fletcher.github.io/MultiMarkdown-6/
If it is for output, I would suggest using HTML to define the nested lists.
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thank you for the info and the excellent references !