Legend for Pie chart

[MichiMei]

For pie charts a legend mapping the colors/data to a string would be nice. (similar to YCharts: https://github.com/codeandtheory/YCharts?tab=readme-ov-file)

A second small improvement I would like is the possibility to use Int as data type. For a professional look I really dislike the ".0" displayed after values that can't really be real numbers. For this one I'm uncertain what the cleanest way to handle that in Kotlin would be (as I'm quite new to Kotlin :).