There’s some code in this post that creates different modulation waveforms: https://forum.audacityteam.org/t/add-waveform-options-to-isochronic-modulator-plug-in/15908/1
It’s not a full plug-in, it’s just a snip of code for creating the modulation waves. You will need some understanding of Nyquist/XLisp to be able to integrate that into the plug-in.