I liked the Leptos JSX syntax and I feel like Dioxus is addressing a different problem. Dioxus specifically markets itself as a tool for universal app development. I looked at it, Perseus, Askama + JS, etc, but ultimately thought Leptos seemed like the best to dive in with.
For charts and plots -- I was thinking about the same thing today, actually! I've usually done those manually with SVG and JS. I was wanting a framework, and spent 30 minutes or so today looking at tools to use R diagrams on the web [0]. Also thought a little bit about making my own library. There are existing libraries like Plotters that should plug and play with Leptos just fine [1], but I haven't tried any yet.