Currently (2.11) "Mixed content" is only exposed in case of textual content preceding an element, like:

<root>
   some text
  <child> ... </child>
</root>

but is not retained or exposed in token stream if it comes after a close element, so none of text segments in:

<root>
  <child>...</child>
  first text
  <child>...</child>
  last text
</root>

are exposed. This means that although as per #403 JsonNode could now express such content (considering nominal key of "" for text segements), but does not get them as FromXmlParser does not create matching logical tokens.
This should be fixed.