[NTG-context] axis values (other than weight) for a variable font

Dear list, I have the following sample: \definefontfeature [book] [axis={weight=400}] \definefontfamily [mainface] [rm] [Recursive] [features={default, book}] \setupbodyfont[mainface] \starttext \input zapf \stoptext This is for Recursive a variable font by Google (https://www.recursive.design/). In addition to the weight variable in axis values, it also contains mono, casual, slant and cursive. How can I modify this values from ConTeXt? Many thanks for your help, Pablo