[NTG-context] set fallback in \definefont

Hi, Is there a way to set the fallback for fonts when we define them not as a typescript but using \definefont? \definefont[MyFont][Font.otf*MyFeatures] Is there a default fallback one can specify? Is simplefonts module deprecated or discouraged now? When we define a font via typescript commands, we can specify rm, ss, tt, mm, hw and cg shapes for it. Can we add arbitrary styles? For example, I would use this for quotations, headings, etc. Currently, I either have to spare ss or use \definefont for such scenarios. Thanks, --MHB