Hello, from what I understand from other posts on the forum, not all Plotly modules are available inside of Anvil at the moment. Once Anvil updates to a newer Plotly, you should have more options.
Having said that, I’m not sure if pie charts are available or not at this point (I don’t often use Plotly). Have you tried making a pie chart (based on Plotly docs) and gotten an error? If so let us know.