qt5 assistant doesn't fully support html& css

Dear Qt developer,

Our company use for qt4 for a long time, and recently we update to qt 5.15,

and we also update the usage of qt assistant to qt5 version,

but after we update, we found our help document (base on assistant) format change a lot, 

lots of our pre-define document style changed or unsupported, 

After some study, we found qt5 assistant isn't implement base on webengine, it just use textbrowser to implement the assistant ( similar [issue|https://forum.qt.io/topic/97080/how-to-force-qt-assistant-use-qt-webkit-or-qt-webengine-if-it-possible),]

we have to continue use the qt4 assistant, while the other application update to qt5 libs,

can you please tell us when will qt5 assistant support webengine and css fully?

or what your plan time schedule to support that?

or is there any other workaround?

Thanks,

Jeremy