ProPlot author here: Due to my day job as a graduate student, certain feature additions may be delayed to the summer of 2020. In the meantime, if you are interested in contributing to ProPlot, please see the contribution guide. Any amount of help is welcome!
Add fonts packaged with ProPlot or saved to the ~/.proplot/fonts
folder, if they are not already added. Detects .ttf and .otf files
– see this link
for a guide on converting various other font file types to .ttf and
.otf for use with matplotlib.