[O] Nested ordered (numbered) lists

[ST]

Hi,

is there a way to produce nested ordered (numbered) lists and get it
exported (to pdf/html) properly? Like:

1. item_1
2. item_2
   2.1. subitem_2_1
        2.1.1. subsubitem_2_1_1
   2.2. subitem_2_2
3. item_3

Thank you!