[NTG-context] simple graphics, Metafun vs. ConTeXt

I have leaved through the ConTeXt and MetaFun manuals on the search for examples of graphics resembling the attached file which I created in TikZ. I was wanting to switch to something more native to ConTeXt, but haven't quite found a way of realising it in ConTeXt or MetaFun. Maybe someone would be so kind as to point me to the right section in the manual. All I want is to define text boxes (of a fixed size) to fill them with a background colour and (centred, typeset) text. Do I need MetaFun for that, or should some table/framed text environment in ConTeXt be able to do that? Many thanks, Severin