The biggest upgrade is storage space and row capacity. There are only a couple of components that are included with the pro plans. All components you see on the free version are what you would see in a pro version. The only difference is that some are marked as pro or will tell you of they only work with pro plans.
As for charts, there are no additional chart options. What you see with the free version is what you get with the pro version. If you want more advanced charts, then I would consider implementing quickchart.io as an image.
The pricing page lists what’s included with the Enterprise plan. Mostly advanced support, API access, SQL access, security audits, and more scalability. It’s primarily for businesses. Keep in mind that prices for that plan start at a minimum of $6000 a year, but in most cases, I think it’s around $12,000 a year. ($999 a month). If you’re only looking for additional components, then you aren’t going to get it with the Enterprise plan. It’s more for back end data processing and customer support. Like I said, most of what’s available component wise is available in the free plan.