+1 to echarts: While it can be more complex to start than the others, it remains fairly simple for the default graphs while providing enough flexibility to do pretty much anything.
Charts that used to take me days to set up and data-wrangle now only take minutes.
I suppose this applies to other libraries but I like echarts.
DATA: {json array}’
Dumping your data into the context window tends to help specify the task and focus the AI on the data structures to use.