New tooltip "Report page tooltips", possible for custom ?

Hi all, 

I saw a new kind of tooltip in preview:

How can we use it with a custom chart ? What do we have to do in our tooltip code, like to enable the tooltip field in filters ? 

The link for it here.

 It said it not enable for custom chart but it was in March, is it the same now ? Do we have a release date for this feature ?

Thanks !

EDIT: It is possible to do it with API V1.12.0 but I didn't understand how we can switch from a default tooltip to a "canvas" tooltip ? In this link, I see what you have to do in capabilities.json but can't understand how the switch is done...