org-element tutorial?

[bvchgvbt]

Hi,

Does anyone know of a good tutorial on using org-element? I'm finding
the documentation hard to grok.

Alternatively, given a doc like

* TODO No
** Uninteresting
   - item 1
   - item 2

* NEXT My thing
  SCHEDULED: <2023-05-16 Tue .+1d>
  :PROPERTIES:
  :STYLE: habit
  :LAST_REPEAT: [2023-05-15 Mon 12:12]
  :END:
  - State "DONE"       from "NEXT"       [2023-05-15 Mon 12:12] \\
    I want this

how would I get at the note entered for the state change, i.e. the "I
want this" list item, in this example  (which might be in a drawer,
just doesn't happen to be, here)?