Import of XLIFF file

We are using Passolo Team Edition 2018. For an embedded device we are trying to interface with Passolo using XLIFF files. This works more or less, however, one point we are struggling with is the import of comments or notes. We specify notes in our XLIFF files according to the XLIFF standard:

<trans-unit id="StatusNotification" maxheight="13" maxwidth="252" size-unit="px" translate="yes">
  <source>Test ON</source>
  <target>Test EIN</target>
  <note>No translation of Test</note>

I did expect that this would show up as a comment, alas, this is not happening. What do we need to do to extract and show this as a comment?