Customizing list numbers

I read in Harlow 1.2.3 manual :

If you use multiple 0. tokens (0.0., 0.0.0. etc.) for the bullet, you will make a nested list, which uses different numbering from outer lists, and are indented deeper.

Though, when I create a nested list (Twine 2 online, Harlow 1.2.3), I get the same numbering for all levels.
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Is there an easy way to customize the numbering ?