Love this feature! Yahoo released the possibility to explore charts with audio, in the finance app, when using screen readers in 2019. You can do now something very similar since iOS 15.
You can move your finger in the x-axes, and it will play a sound with a different pitch depending on the data in the y-axes, making it easier to identify trends in the graphs.
You need to conform to the AXChart protocol by implementing the accessibilityChartDescriptor property.
Documentation: https://developer.apple.com/documentation/accessibility/audio-graphs
WWDC21 session: https://developer.apple.com/videos/play/wwdc2021/10122/
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