No I wouldn’t count Chorus as a “distortion” effect.
With “Distortion” effects there is some kind of “wave shaping” going on (deforming the waveform).
Chorus is a special type of “delay” effect where the delay period changes over time: Chorus (audio effect) - Wikipedia
We have a good Chorus effect here (2 versions): Chorus Effect
We do see requests for general distortion effects quite frequently on the forum, but we tend to direct them to either the Leveller effect, or to VST rather than to making a feature request. Perhaps some kind of “multi-fx” plug-in could fill the gap for both vocal and instrument distortion effects, though such an effect would benefit greatly from “Preview” which is not currently available for Nyquist plug-ins.