[NTG-context] Caption label

I'm defining a new float that I'd like to caption with its own label. Something like: \definefloat[picture][pictures] I'd then like the caption to read: Picture 1 - my caption text Picture 2 - etc At the moment I've used \setupcaption[picture][way=bytext] to sort out the numbering but I cannot figure out how to do the label. Any ideas? (Apologies for lack of minimal - afk atm) Felix