Weather Binding and Openhab V3.0

Not to my knowledge. For the most part, the trick that the Weather Binding used to accomplish that has since been forbidden for bindings to do so I doubt it.

However, MainUI has a very robust collection of widgets available and ability to build custom widgets. Perhaps there is something there that can replace what you are trying to do.

As an example, if it’s weather you are after, there is a really good one already created and posted at UI Widget: Weather. Hopefully at some point it will be moved to the Marketplace where it will be installable just like an add-on.