Xournal++ can associate recorded audio with note objects, adding context that a static page export may not preserve. The Xournal++ alternatives entry should therefore include more than pen responsiveness.
With everyone's consent, record a short test explanation while writing a note. Reopen the editable project and check the audio association, then inspect the intended sharing format separately. Keep the working project when recipients or future you may need more than the visible page.
Akousa