Fil (one of the Plot developers) made https://github.com/Fil/plot-cli, and Michael Keller has https://github.com/mhkeller/plot/, which supports Plot (and Vega-Lite and Plotly). Could probably be more robust; feel free to make feature requests, I know a few other people have asked me about this.
I've been using GNUPlot in drawing chart in emacs. Plot has much better examples and I'd like to try this instead.