In my experience using Django for my webapps hasn't meant I can avoid HTML and javascript. Writing templates is writing HTML, and any relatively fancy UI including charting etc. requires using javascript
I built a recent Django site that only used JS for analytics and to implement the close button on a modal. You can do charting using server side rendered images pretty easily, especially as SVGs (although I concede, dynamic charts client side are a better UI). CSS is harder to escape if you want things to look fancy.
Given the update latency pynecone has, I can't imagine a charting library would work well.
Given the update latency pynecone has, I can't imagine a charting library would work well.