How to use HandwritingInputPanel of Qt Virtual Keyobard?

[ynakane]

Hi.
I want to use HandwritingInputPanel QML.
I found an example which is basic.pro.

When I built and tried it immediately, the virtual keyboard appeared, but the handwriting input key panel did not appear.
I tried adding handwriting and disable-desktop to CONFIG, but it didn't appear.
Do I need to do something like add some other module?

Thank you for your time.