Custom Element when using Editor X

Hi, is it currently possible to use Custom Element when using Editor X ?
(https://www.wix.com/corvid/forum/news-announcements/new-feature-custom-element)

I can add the javascript definitions, but Editor X seems to not providing interface to instantiate the element. Could you please help ?

Thank you, its interensting tool for me.

Last time I checked it was NOT possible.