[NTG-context] Fuzzy lines

Hi MetaFans, is it possible to get lines with Metapost that look like they were drawn with a pencil or brush? Some vector graphics apps (in my case: Affinity Designer) can use such naturally looking brushes for vector graphics (and I don’t know how they do it), but I’d like to automate/parametrize some designs, and that would finally be a reason to learn Metapost... Hraban